Spider, I have a Tower 40 trainer with an OS Max 25 on it. It came out very nose-heavy and landed too fast. Thanks to help from this forum, I figured out the CG problem and moved my battery toward the tail. It made an amazing difference on landing speed.

Lower pitch props will make sure your idle (which is great on the engine you have) doesn't develop too much thrust so the 11-4 suggestions are good ones. Here is a link to a bigger wing I built for mine to slow it down even more. The Tower Hobbies Trainer 40 is a tough bird and a good flyer once the CG gets in the right place.

http://www.youtube.com/watch?v=4EkaU9emYWU

BTW, my CG is 8 cm back from the leading edge of the wing.