I used to run my OS 46AX at 13600rpm with the 10x6... I killed the engine after a while
Note that in the catalog they specify a theoretical range up to 17000rpm with a power peak at 16000rpm (never happens in real life)

I bought another one, installed the 11x5 and 11x6 and event went up to the 11x7 then 11x8; and finally tried the 12x4 on 3D planes
They all run differently, but I feel you get the best out of this engine with the 11x5, 11x6 and 12x4. It depends on what you need.

After all, the manufacturer, for breakin, I think, should be recommending the ideal prop in its manuals