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Trey -

Discard the hydrofoil. That is a bandaid covering the problem of the engine being too low.

Move your engine up 2 holes to start. Trim the black piece of trim if necessary.

As for props - It is typical when changing from a 3 blade to a 4 blade to drop 2 inches of pitch.

I show owners with the Mercury classic 40hp and a 13/15' hull to recommend either a Mercury Black Max in 15" of pitch or a Yamaha painted stainless in 14" of pitch.

I would remove the foil, raise the engine, test the boat.

Then change the prop.