Slyder - brought up a good point in an earlier post you might also want to check. Are you getting an even throw up and down on your elevators? Make sure they are mechanically set to neutral with your elevator trim set to neutral as well. Then check the throws and the speed. If one elevator goes up a little more than the other one this can cause you to roll out of a loop. Each elevator should move at the same speed as well. If you have one moving faster than the other it can cause the same results. Just something to check while you are doing the lateral balance.