I have several Brison 3.2's and have found that proping for more than 7000 rpms on the ground gains little or no advantage in the air.
These engines are at their best between 6200 and 7000 rpms . I prefer the NX 22-8 for best overall performance for aerobatics. the 3w 22-8 is also very similar in
performance . For scale flight a 22-10 works well.