photoniq:

You stated you had to add a ton of lead to the tail; consider what I did with my 4*40 (see attached pics) as a way to balance without additional weight. I installed an access panel in the bottom of the fuse behind the wing and placed my battery amidst wads of foam in the rear of the aircraft. This might necessitate adding additional support struts inside the fuse, but mine worked out great! Battery not heavy enough? Move it further back, or go with a 2000 mah nicad for additonal weight AND flying time! Enjoy!