Johnmpa,
I'm using a os .46fx. I assume when u say tail heavy u mean nose heavy I'm hopeing I got the name of the former right. I was thinking of moving it behind the former that's at the trailing edge of the wing. I was trying to think of how to secure it. Hadn't come up with anything yet. I'll keep thinking on it, and if I come up with anything I'll let u know. As I have it now at the very back of the compartment under the wing, I built a little box out of scrap for the battery. It's wedged in pretty tight with some foam. I will probably do the same with the skid for the bit of extra weight I'll need. I'll just grab a piece of steel and pull out the trusty dremel and cut off wheel to cut it down to weight, then epoxy to the bottom of the tail.
-John