Taking the baffle out will help you in gaining RPMs.

I will probably get flamed for this, but I think the 12 1/4 x 3 3/4 prop is too big for .46 sized engines. It seems ok for the .50 and .53 engines out there, but tends too work .46 sized engines a little too much for my taste.

The APC 12x4 is a little better, but my favorite is the APC 11 1/2" x 4.

I would suggest trying all three, and make your own call. I think 11,600 on a .46 sized engine is not high enough. I would shoot for 13,000 minimum, but thats me.