Rog, Glad to hear things are working out for ya. Sounds like your having a good times with wheels I'm not quite sure why you limiting yourself to a 4 ounce tank, but that's your call. Keep it up.

If it won't fly hands off then I think you still have some trim issues. Mine will do it even in a fairly stiff wind, of course big gusts will knock it off track but it will fly hands off at half throttle most of the time. Especially on the downwind leg which is where I usually try to trim my planes at. You might want to check your linkages. The straighter you can get everything set up mechanically, the better it will fly & the easier it will be to trim for hands off flight imo.
Good luck & have fun!!