Not many adults these days with the norm of takeaways under 70kg 
My advice to lightweights - try to put every ounce of your body weight thru the harness.
I use quite short lines 24inches with a very high boom - this helps me to power up the harness.
Use a surf seat harness with a very high sliding hook. High hooks reduce the lift of the board. Sliding hooks help you to put more upper body weight to the front of the board in the gusts.
And lastly,experiment with many different fins,as well as smaller sized fins.
The Techtronic Falcon is my favourite in really strong winds.
Best fin ever for putting the hammer down in the gusts.
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
if someone wants the boom lower ...
saw on iwndsurf that people rigged the sail without putting mast through bottom section of the luff
and just through the top
that way they were able to connect two booms to the mast - one for a kid lower down
sail may not be ideal, but they had some rockin' videos !!
this is Kevin Pritchard with his nephew ...
www.facebook.com/pritchardwindsurfing/videos/1358818187463380/
sorry it is on farcebook ... cannot seem to get video url only $%^&*((
also, one can put as little mast extension as possible and downhauled all the way - too obvious
for taller people it is easier and more efficient to just put some extra extension ...
Select to expand quotesboardcrazy said..
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
Either that or sail in high heels. Might dent your board though.
Thanks for posting this...an interesting read. Makes me feel overweight at about 70 kg.
Select to expand quotesboardcrazy said..
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
surprising. I like to have the boom about 3/4 of the way up the cut out, with 30 inch lines
70 kg is a heavy weight compared to my 56 kg
Select to expand quotejoe windsurf said..
if someone wants the boom lower ...
saw on iwndsurf that people rigged the sail without putting mast through bottom section of the luff
and just through the top
that way they were able to connect two booms to the mast - one for a kid lower down
sail may not be ideal, but they had some rockin' videos !!
this is Kevin Pritchard with his nephew ...
www.facebook.com/pritchardwindsurfing/videos/1358818187463380/
sorry it is on farcebook ... cannot seem to get video url only $%^&*((
also, one can put as little mast extension as possible and downhauled all the way - too obvious
for taller people it is easier and more efficient to just put some extra extension ...
Wouldn't work with cammed sails..years ago I had the sail maker make the cutout lower but that was in the days where I had a complete 4m made by one ..maybe I couldn't buy one locally or I just wanted fancy colours?? 
Yes I will have to check the extension..I'm pretty sure I have it on minimum on most but one sail may have a hole to play with..
The Severne cutouts have a fancy zip insert so that wouldn't be as easy.
Select to expand quoteNotWal said..sboardcrazy said..
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
Either that or sail in high heels. Might dent your board though.I can't walk in high heels netherless sail.....mind you I can't sail that well in normal booties..
Select to expand quoteWindxtasy said..sboardcrazy said..
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
surprising. I like to have the boom about 3/4 of the way up the cut out, with 30 inch lines
70 kg is a heavy weight compared to my 56 kg
I find the Koncept a bit more user friendly.
How tall are you and what sail brands do you use? I'm 5'5"..sorry don't ask me to post in cms..
Select to expand quotesboardcrazy said..Windxtasy said..sboardcrazy said..
I have to put the boom at the bottom of the cutout .It's still at chin height with 30 cm lines. I keep hooked in even subplaning and I need to be able to get in and out of the lines if the wind is gusty so that's getting a bit high for those conditions. It also means I can't lower the boom to help when overpowered.
I may have to get some 32cm adjustables and place the lines closer together although I like having them wider.
surprising. I like to have the boom about 3/4 of the way up the cut out, with 30 inch lines
70 kg is a heavy weight compared to my 56 kg
I find the Koncept a bit more user friendly.
How tall are you and what sail brands do you use? I'm 5'5"..sorry don't ask me to post in cms..
KA Koncepts and Tushinghams.
I haven't measured myself in a long time but I used to be 5'6". I do have relatively long legs.
