To balance mine with the cowl, and the FG-11, which weighs the same as the 100, I would have needed to add 4 ounces to the tail. I wound up cutting the bottom covering two spaces behind the wing, putting in some support and mounting the battery pack and 1 ounce lead back there. Worked perfectly.

I also did a dumb thing(which prompted the rebalance and cowl), I flew it a few times a couple weeks ago and one last time, went to take off, wind had changed direction so it was opposite of what I had been taking off of, and tail came up, nose pitched forward due to being nose heavy and I over compensated, so off it went, not fast enough for the wing. I tried to recover with rudder, but just couldnt level off in time and cartwheeled it. Ripped the wing off, pulled the bolt down block out and cracked the fuse at former 2 and 3. Its all fixed up now, and reblanced so it wont nose over when it comes up level.

My LT-40 tends to take off the same way, nose down a bit, and I know its nose heavy too, just a hair, but the long fuse on it prevents it from lifting off too soon.

The FG-11 is the fight amount of power for this plane, I would fear over powering it would rip the wing off. It can do some wicked maneuvers.