What do you mean the cg is way off using the 1320 battery? I'm using a TP 1350 battery and the cg is adjustable between 3 and 3.5" just as described in the manual without having to move the battery through any bulkheads.

Unless you mean that recommended cg range is non-optimal. It does take a lot of down elevator to hold level inverted flight. Has anyone found a cg spot that balances the plane upright and inverted with no elevator input? (I've been waiting for this answer in my own thread for days now...)

Clark