Barry,

First thing is I fly with whaturi quite a bit and I am not doubting his skills one little bit considering the amount of time he has been flying.

The plane in the pic is my old one that had the fireall torn out do to a dead stick and an off field excursion and I will say this it would hold a hover just fine and that was with the Fuji43 on it. My current one will also hold a hover for as long as I can with a DA50 which isn't that long but I have the same amount of throw and it will stay there.

Now for the differences that I feel is causing this

While I think the ailerons not going all the way to the root does not help I feel this is not the whole issue. There are several planes out there with no where near the aileron throw or even size (chord) of the ailerons. Heck, the GP Ultimate has no where near the size or throw of ailerons that the Cap has nad it will hold a hover just fine, but again as long as I can

Based on this I think that since whaturi is constantly adjusting the throttle, this is well known to cause a plane to go into a torque roll and is a major cause of this. When I enter a hover, I go into it nice and smooth and get the plane standing straight up with as much as a constant power that I can. Torque rolls happen because of throttle changes or even on rare occasions, too much thrust to one side. So now what I think needs to happen is too find a spot in the throttle where the plane sits there and remember that. make small changes to throttle position and it will not torque roll as quickly which will not overcome the ailerons

Again, all is just my opinion for being there first hand when that pic was taken and his comments to me about the plane

Now as far as the 58, yep, it was definitely WAY overpowered. I though he was nuts for stuffing that in there but it worked out pretty well until it swallowed a bearing from a previous crash and a pretty sever prop strike several weeks after the crash.