I discovered it balances with one battery pack in the rear,and one up front.I cut loose the rectangular piece of ply that is only there to hold the pushrods in place,and I glued some balsa on the back of it making a battery hold down,then used some spare screws to re attach the plywood.That way I can remove it if I need to.Took alot of frustration getting it in there,but hopefully it will hold up ok.I like your idea of just using a higher mah battery,but I also like the idea of having the spare battery in there for safety.I hooked mine up with 2 switches,and fed the extra battery into an empty servo slot.Had to borrow the switch and battery from another plane.This will get me started.I can always experiment later....after I forget about how much of a royal pain it was the first time lol.
Now i have to figure out how to balance it laterally.Never really done this before.
anyhow,thanks for the help