I have a knock-off of the old OS 46 SF, the Leo 46, turning an 11x6 APC prop. I get about 11000 rpm at full throttle and the plane flies nicely for most purposes. It loops well although generally I need to dive a bit for extra speed or the loops are a bit floppy.

Maybe I don't have enough aileron throw to get smooth rolls - I have not made any set-up changes to the plane since I used it to learn RC flying 6 years ago. In fact, I have been flying it on floats for the last 4 years, and I haven't been attempting rolls so I kind of forget the details of how it handled back with the wheels on.

As Seamus said, back to the topic - there is plenty of lift in the LT-40 wing so you can afford to clip some of it off if you want.