Wiker: I assume you have the MPX ASW27B? This is a beautiful bird on the slopes, but they use a modified RG15 profile. This profile works good, but are known to stall in hard turns
There are some of these planes in my club (I have one yes...) and they perform extremely well when flown on good slopes. But the profile is not good when you want to do F3F-turns, especially the wingloading is a bit too high for tight turns. Don`t think any of us have moved CG backwards, but might be worth a try.