if the airplane consistantly won't slow down adequately to land... try the next lower pitch prop... usually also going to the next larger diameter to maintain the load factor on the engine.

The lower pitch provides less pull at low rpm. Larger dia provides more "disk area" and that gives significantly higher static thrust (which is what you want for high climb rates) Top speed of the model might be reduced a little... but I doubt you'll notice. (sometimes top speed increases if you are still in the speed range where static thrust is more important than pitch)