I can speak a little to the Seagull Funfly 3D (weighing 5.75lbs) having eight flights so far on it. The first six were with an APC 11x6 (static 12k) which produced unlimited vertical at WOT. The plane flew relatively fast and too fast for the large control surfaces on the Funfly.

Changing to the APC 14x4 funfly prop (static rpm 9K) slowed the plane considerably, allowed more throws and less throttle jockying. It also quieted the engine a good bit. Unlimited vertical required less throttle but a slower ascent. Idle rpms were reduced considerably with the 14x4 from 2500 down to 1700. Landings were transformed from flying it to the deck to stalling it in and were much slower and shorter. With a wing loading of around 16, it simply wouldn't quit flying with the faster idle.

The 14x4 looks big on the plane but has 1.5" of ground clearance when plane is level. If the engine will run cool enough, I prefer it for this airframe.

The only negative noted so far is that a vertical line suffers more left yaw.

If it were a pattern or aerobatic plane, I'd think a 11x8 or 12x6 would be a good choice. If wing loading were in the twenties, it would likely have no problem coming down with a faster prop.