I've recently put together sig's 4 star 60 ARF put in tower's 60 engine, but can'nt balance at 2 and 3/4 they ask for. already added full bag of 4 oz. at nose and move engine all the way forward. Put battery an reciever at back of tank. So questions is can the 4-star be flowned at CG of 3 and 1/4 or 1/4 inch passed rib peak. Has anyone done this or will i be the first, don't want anymore wieght.