RE: Ziroli Panther
I have found it more effictive to use carbon sheet goods (.5 oz carbon mat) to do the finish in place of fiberglass. I got mine from BVM but I'm sure there are lots of other sources. The monocouque layup with carbon mat is as strong as rods and extends across the entire surface instead of only one direction as with a rod.
Mine is also covered with FliteMetal so that may be keeping down the possibility of flutter in my stabs.
I'm running a Cheetah so I'm over 1:2 and have had no trouble even at full steam, but I may not be fast enough yet to flutter.
John