In level flight, I think you will have very good speed (even with that big plane and small engine) but as soon as you will get the nose up, your RPMs will drop to that 9300 and the aircraft may slow drastically.

To me, it is not a goog thing since you will have to get speed far before any vertical maneuver and go vertically the ballistic way. That is not very good for that constant speed we all try to keep...

Stick to the APC 13-6, all you are missing is 1/4 lb of thrust to have about unlimited vertical and at 11 300 rpm you must have the speed and thrust needed for anything but vertical snaps.

What is your airplane ? Sounds like a very light Extra you have !