hmmm interesting.. but to each their own. i prefer to keep it simple. i just put in 1800 mha packs and fly till my thumbs get sore!! as for the aft cg.. just be careful how far back you go. too much and the plane is unflyable. nose heavy is good tail heavy is bad. if you want to do aerobatics i recommend you get a plane designed for that purpose. hate to see that you planted a balsa tree. aft cg will make the model really pitch sensitive. i personally dont find that appealing. but good luck to you with your aerobats.