Does anyone have any experience of the hangar 9 sukhoi 3.1 meter , I have just put one. Together with a DLE 170 up front and when I came to do the CG I find myself having to put 24 oz ,s of lead in the tail to get any where near the balance point as per the instruction manual of 10.5 inches from the tip at the trailing edge , can this be correct . MK