Wouter

I will try to help, although I have not used the AHPC mast so I can give you no settings.

Still the same rules apply to all rigs, basically you are trying to achieve the most powerfull sail that you can hold on to and still keep lots of mainsheet tension without falling over or having to pinch and go slow.

It is usually about how you de-power the sail that makes the difference in speed. This is achieved by bending the mast. It sounds to me as though you have too much power when sailing 1 up, so when you sheet hard and point up the high drag sail goes slowly so to keep speed up you are sailing lower with a loose-ish mainsheet, which is also high drag.

The standard way is to downhaul the sail untill you can go no further, then pull the mast rotation in. the problem with this system is that although as you pull the mast in it cause the lower 2/3rds to bend more, it stiffens up the top 1/3, so some stiffer battens may be required.

Another way, is to leave the mast rotation as it is (about 75 degrees, then when you get above max downhaul conditions loosen off the diamonds by 2 full turns so that when sailing the windward diamond is loose, this has several benefits, the top section is still in the bendy mode, the lower section is allowed to bend for and aft to take up the slack in the spreaders, so flattening the sail, and the mast still remains at the optimum angle of attack for the leading edge of the wing. I think this may work particularly well on your rig as it has a more pointy front, (the rounder fronted masts are more forgiving to angle of attack. When doing two boat tuning on Stealths sailed single handed we found that loose diamonds, truck loads of downhaul and a very very stiff 3rd batten were very quick in above 12 knots, we also dropped the traveller by a couple of inches, going as far as 40 cm in very strong winds.

Some more info on the speeds in different wind conditions would help.

regards

john