If I were in your shoes, I would try to use a 12x6. The 12x6 is in the middle. To fly slower a 13x5 would work too. Nothing wrong with your propellor, but it will be on the fast side, and may not slow down easily on landing. Propellors need to be matched to the airframe's needs AND be within the recommended range of your engine. For your Easy Sport and a .60 engine, a 12x6 prop is a good starting point.

Here's some info on HB Engines http://www.mecoa.com/hb/index.htm

Happy Flying!!