5x5 might work, but then you may have trouble where you start duplicating reactions. I might suggest you take whichever of the 3 is older (I'm assuming the hot rod) and use that layout if you're going to duplicate a layout...that way, if you decide they're close together, at least you'll have the jolt (which, being newer, should hit harder).
The 2x2 is a great idea. I'd just throw it without the weight hole in practice first. Drill it with a crap-load of side weight and just see what it does, then put the weight hole after you're done having fun.
You could always go with something ludicrous like a 7x5, which would keep you away from the weight hole, but give you a negative pin. another one I've seen that I really like is this one: not sure what it's called, though.
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The guy I saw throwing it has a ton of side turn, but the ball is a bomb to the pocket on the backend.
I might be tempted to go with a hook and stop layout...something that's going to almost intentionally rollout for you, to give you a totally fresh look.
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