I've finished putting together my Phoenix Spitfire .46-55 ARF. The C.G in the book say 90mm to 95mm. When I put it at 90mm I have to add a little under 6oz of weight just behind the engine to get it to balance. Does anyone else have experience of the best place for the C.G to be? I'm using electric retracts (so that adds a little weight in front of the C.G.) and the receiver is a 2000mah pack placed just behind the engine. Ss I'm curious what other people think and how did their Spitfire fly?

Thanks for any helping comments.