The next time you go out in a good breeze try a few things when the weather helm starts.
First, sheet out the sails
so they are nearly to the point of luffing. When the boat stops heeling quite so much then you should have reduced weather helm and the speed of your boat should increase.
Second, when the heeling starts haul down on the boom vang
and point into the wind
a little more and see if that helps. If you can't point into the wind
because your course is not to windward then ease out your mainsail
and see if that helps.
Third, if you've done all the above and your sails are adjusted just on the point of luffing and you still have lots of weather helm then put a reef in the main and see if that helps.
On most boats, the more you heel the more weather helm you have and the more your rudder
acts like a brake. The point is to sail as flat as possible so adjusting the sails to do that is what your goal should be.
Good luck and let us know how it goes.