Sounds like a great first flight..... I have a seagull Edge 540 with the wing glued together, an older ARF - I believe, and am having problems with the balance... Was flown with a Saito 100 and flew great... but wanted more power... Now has a Magnum 120 and has not flow yet... can not get the airplane balanced as it is either tail heavy or nose heavy... I have added a lot of lead to the tail trying to balance... The airplane rocks either up or down when it is close to balance..

The engine is mounted about 3/4 of an inch forward to much for the cowl but the thick adjustable motor mount requires the position.. will soon change the motor mount... Any recomendations?
Trying to balance between 3 3/4 to 4 inches from leading edge with the airplane upside down on a balancer.... Thanks..