Here's the fix. Still a little rough but it does fly. I wasn't sure if you are using the Overload mod, so didn't do much of that (only to the min/max control of the hinges and jet is now x1.5 power). I added a few more hinges for the wing fold up, hope you don't mind. reduced drag by rearranging some of the blocks and adding a few. Don't deactivate or move Gyro. If you want experiment with the gyro, either increase roll range percentage a bit, or decrease the stability slightly.

VTOL: (left slider up for the wings fold in). VTOL down does nothing now.
AG 1: jet
Ag 2: car engine

Flying: It doesn't fly like a fighter jet, instead rolling/turning is very gentle curve. Use roll + yaw at touch for slightly tighter turns. Try NOT to pitch (especially down) while rolling/turning it still may stall. Also, before turning/rolling from one direction to the next steady straight first for a while.

Landing: power down pretty early, as you touch down fold up wings a bit (1/4) to slow even more.

Additional fixes appreciated.