ORIGINAL: polstery
I think its the other way around If you want to slow the plane down but still have the hover you need something like a 10x4 or 9x4, the 12 x4 and bigger are just going to bog the motor down. larger props are more efficient meaning it will product more thrust at a given rpm which means more speed.
Long low pitch = high static thrust and low max airspeed.
Short high pitch means minimum static thrust and maximum top airspeed (if the plane's drag doesn't win...)
Hover is 100% dependant on static thrust. More is better... so the long low pitch is correct.