Re: Is a hydrofoil a good idea?
I am with jim, that is not what they were made for, they are to get the boat to plane at a lower speed, may make steering even harder.
You may want to unhook the steering cable from the engine and see if it is still hard to turn, if not check the engine, It has zerk fittings for grease and may not have been lubed in a while.
Basically go through the entire steering system, eventually you will find the problem.