Today I borrowed Waricles Loft 100% RDM.
Doesn't look much different and the gap at the clue is still the same.

I managed to buy the Gen 2, 5.6 & 6.8m HA (2027) pre-production sails from SurfSail Australia, 2 sessions on the 6.8m so far and I am blown away. Buttery smooth acceleration, perfect control and balance - The new range could be a game changer in the evolution of windsurfing and windfoiling. Once I've had a few more session and tried the 5.6m I'll drop a review.
I had the 5.6 out in light wind with a loft 4.0 RDM, worked a treat, light and effortless once planning. So bottom end is great just need some stronger wind to test the top end.
Picked up Dave's 5.0 today, tried to rig it on the 370mast, but it needs a huge extension, that I don't have.
I rigged it on Waricle's 4.0, and it fits fine, but I don't think it's ideal, I'm going to borrow his long extender and see if there any difference.
Pics to follow.
sorry guys I give up, I've had 2 goes now at posting the pics with a write up, and I'm not doing it a third.