Any one have any ideas on how to stiffen the tail? I've seen one of these fly with a Saito 1.20 or 1.50, not sure which, and the horizontal stabilizers were wobbling when the plane was flying at full throttle. I thought of putting expanding foam in the tail to stiffen it and prevent this wobbling on mine. Any opinions? I'm afraid of splitting the fuse if I put too much in.