I agree about the right prop for the plane/engine. I acquired a plane that was a scratch build of a Fly Baby. It had a 62" wingspan, and weighed about 7#'s, so I figured it would require a .60 to .65, right? That is what went in it with a 13x6. I had to fly it into the ground at idle to get it to land. I then tried a 14x3w APC prop. It is a low pitch "W"ide blade to keep a load on the engine. What a difference it made! I could actually land the plane at idle...
I came to find out a year after I got the plane that it was made for a .46 2stroke. (I liked the extra power, 60 degree clims was cool, but not realistic).

I have heard of other people having problems landing on mains only, can't seem to 3-point a landing.

Here is the key:

Stall speed = X
Prop pull must be less than X at idle.

Here is a link to a simple spreadsheet in Excel that I created.
It'll help in several aspects off your engine/prop/weight problems:
http://dutchessrc.com/tools/tool1.xls

I hope this helps....