Hello Geisty:
I have an explanation for what could have caused your crash, not saying this is the ONLY possibility, but it would explain the crash and the correct behavior of your radio before and after the crash. Vibration of metal on metal will cause this exact problem. When you throttle up, the vibration amplitude gets worse and this can command some servos to go full tilt in one direction. I observed this exact same scenario in a friend's plane with a 3W-75, only his plane went straight up because it went to full up elevator. I yelled for him to throttle back and he regained complete control. On the ground, I found that he had 4/40 pushrods to the elevators with metal clevises. The fix was to put locknuts on the clevises so they couldn't vibrate against the rod. My guess is that only the elevators had trouble because the servo wires for the elevators were close to the clevis.