Eric - yes, I have thought about this and there are one of two solutions that I can see. Either use washers to fill in the gap of the extra threads, (although it might look foolish) or use what ever device that i grind the fins with to grind down the screws proportionally. or even find shorter screws at a hardware store.
The whole point of me doing this is to not have to spend money on new fins. I realize that it may not be THAT expensive for them, I just can't justify using potential gas money when i have perfectly good fins and a whole lot of down time that has me bored to tears.