I tossed around your idea before I went with my set up. They call for 70 to 75mms for balance and the 1900 lipo fit the bill not to mention it was handy. Mechanical retracts are notorious for having issues. I went with MG servos and have them set perfect right now but they can get out of whack pretty easy causing stalled servos which will kill a pack pretty quick. I feel comfortable with this arrangement. If I go with a bigger battery down the road I'm going to try your idea. Thanks I appreciate the input. Test hop in the morning. Mike