RE: How to balance this thing?
Did you have fuel in the tank when you balanced? Should always be empty.
Where's the reciever?
Most important, fingertips are NOT reliable when balancing. Either buy or build a balancer, simple one uses two pieces of 2x2 cut and squared of, then drill holes such that you can insert two pieces of 3mm piano wire vertically to balance on. Far more accurate, and you'll probably find that some of your tailweight disappears.