I have the 12.25x3.75 on my Magic right now and it just doesn't have the transition it needs.

I'm going to start cutting down the prop a 1/4 inch at a time as I like the 3.75 pitch but it's just a bit too much prop for this engine.

ALSO, I had the .46fx on my Dazzler ARF (RIP) before the Magic and I found the 11x5 APC to be the best combo. For some reason the Dazzler liked the airflow better than the 11/4 or 12/4.

Note, all props are APC.