If you don't mind me suggesting a few things. Why don't you sand down the back some more to take some weight off the back. try to get it off the rudder and elevators. That should help some. Then move your speed control and timer as far forward as possible. I see you have room so use it. With electrics I always try to shift the weight around as much as possible. I try at all costs to avoid adding anything. Save some more weight by not painting the fuse. Sand it smooth and put a coat of clear on it and then maybe a few stripes or designs using monokote trim sheets. Maybe this will allow you to take that ounce out. another option would be to move the motor forward a little.