Check out this link to Tower Hobbies spec sheet of your engine.
It lists quite a few prop sizes you can try. Basically, you want to reduce the prop's pitch, say to a 11x5, or even a 12x4. With the decrease in pitch, you'll lose some overall top speed but will have greater vertical pull. When you throttle down for a landing, the lesser pitch will also slow you down. Look at all the props the .46FX can use:

http://www2.towerhobbies.com/cgi-bin...=++&search3=Go

Just experiment and see what works best for you. Get a good tachometer and keep an eye on your top RPM's. Don't exceed the recommended range. You can also use the tach to set your idle and make sure it is as low as you think it is. Good luck.

Jesse