I always find it interesting when people talk about wanting to get less weight on the nose. The RV-14 isn't nose heavy at all, and I actually was even glad to have changed out my starter knowing the new one was 1 lbs heavier. The aerobatic CG range isn't really all that wide, and I find that I have to think about my loadings a bit to ensure I stay forward enough CG for things like that. If anything, I've been thinking that maybe it would have been nice to have the ELT not mounted in the tail but mounted right behind the baggage area just to move more weight forward.
So I personally think trying to adjust the plane by making the engine or prop lighter is likely to be a mistake. There's not much you can play with in the back end to make lighter as well, to keep your CG as far forward as possible.