I recently bought the art tech yak but the cg seems to be way off. I saw multiple reviews were the cg was dead on but on mine I have 14g of lead, two bike chain links, and 3 nuts, and even moved the receiver 3" forward into the plane but it still only balances at 2 3/4". When i took it up it basically has no vertical performance, which I would think was from all the added weight. If others are alright it would seem mine is some kind of defect...is there anything you could do to help??