Hello. Just finished the construction and covering of the SIG Kadet LT-40 and I need help to get it properly balanced. The instruction manual set a balancing point for beginners of 3 1/2 inches from the leading edge. There is no way I can get it balanced there. I moved the battery pack and the receiver all the way up front to no avail: still too tail heavy. (the balance I got was one inch to the rear of the balancing point). Adding weights to the front was my next step, however after adding about 8 oz the balance was still way back. Now I am perplexed since I followed exactly the plans and instructions and I can't get it right. The engine is an OS LA 40. Is it the culprit because maybe the plane was designed for a heavier engine? Any ideas on how to correct this? Thanks!