Prop Question

[srf471]

On he the new L2M (C-85) I recently purchased, the metal prop is a CF7148. I can climb out at 800fpm with 450 lbs of passengers at 85 degrees at sea level, but cruise is only 70mph +-. I would really appreciate a quick explaination of the different props and and any suggestions as to a good prop that might allow a decent climb, but still give me a little better cruise. Thanks, Nick Preble, N58075