I did some of my training on a Brightstar and my instructor gave it to me after I finished training. I have some spare parts ( wing, new fuselage, etc. ) so I`m going to cannibalize the old one ( really beat up ) and assemble a " new " one at some point. The old one flew really well with an OS 46 in the nose and 2.5 oz. on the rear fuselage for balance. Don`t know why it would be taking so much or yours. Sure you`ve got the cg machine set up correctly? Personally, I think I`d get some help and another perspective from a buddy if I thought everything was right and I knew others balanced with less weight.