I think its got more to do with the airframe rather than anything else. Consider this..

You got a low pitch prop and are into a harrier. You have to burst the throttle quite a lot to maintain height and also when things go out of shape to increase airflow over the tail. This lower pitch prop will require more rpm to move the air quicker (although the larger diameter will move more air) so the bursts will go "deeper" into the torque curve.

Now although this seems to be the preferred mode of operation during 3D, one also has to consider the destabilising effects of these torque bursts on the stalled wing. The lower prop pitch might in the end result in more wing rock (due to the above effect) than a higher pitch prop which will maintain more positive tail control (higher airspeed) with "shallower" bursts. This will be mopre pronounced with a 4st engine, of course.

I have personally experienced this effect with some planes and decided against shallow pitch props (x4). I go for x6 instead (120 size freestyle ships).

P.S. The same antithesis goes for wing loading. Contrary to popular belief, I have had heavier-loaded planes with better stalled behaviour than lighter-loaded planes (i.e. wing rock)...!