In my fall from 30,000 feet, I had time to try every single possible control combination and still simply fell tail first.

The TA-52 had 3 different wings, intended for 3 different applications. One was for ground support, with heavier pilot protection from ground ack, one was for medium altitude's, 10 to 20,000 feet and the last model was the "H", which had a 3rd different kind of wing. The "H" had 3 degrees of "washout" in the wing from the wing root out to where the ailerons and flaps joined and was intended to increase the pilots stall recovery. First question is, "which TA-52 did Hi Tech model after? It sounds from your post, that you were in a flat spin! If so, if you were rotating to the left, full right rudder, full back stick and full left aileron should slow the rotation enough to then push your stick all the way forward and with a short burst of full throttle, you should recover OK. Interesting post though and from the other comments, should give guys in here food for thought.