Originally Posted by flo617
.... I think this is way beyond a small tuning of the mast.
It may indeed be beyond a 'small tuning' but it could be that the mast needs to be moved forward enough to get the CE ahead of where it is now enough to ease the helm. Less rake, if you have any now.
A flatter mainsail shape will help too, and setting outhaul and vanging down will help some of that if the sail's not in fact beyond useful life.. and it's easy to try first.