Sailed with a 5.1 last sunday gusting 30 kts. Very stable loved it, rigged on Blueline mast.
Rigged to spec, tried about a cm more when the wind increased but the sail was twitchy and harder to handle so when back to original downhaul. Just used outhaul to flatten off a bit. Sail keeps the power forward and i dont get lifted as much just keeps the board on the water and accelerating. I was very happy with the performance. Might try and borrow a mates enigma mast to try.
