-AeroPro Team, Pure Drive, BLX Pro Open, Pro Staff 97S, Yonex Ezone DR 100, Burn 95CV
-RPM Blast, prince synt gut, 4G, Element, Babolat natural gut, Vokl Cyclone...
Yeah okay that explains a lot. Like someone else said , all the racquets you've tried are like the Fed, Nadal, Novaks of tennis elbow causing equipment (save the BLX maybe, never played with that before).
Look for racquets with RA ratings no higher than 65.
Current models I would try:
Prince Phantom for sure
Ezone 98 (stay away from the 100); the DR98 was great and if this one's anything like it, it'll be a treat.
Vcore Pro 97
Wilson Clash potentially?
Blade? I remember the BLX Blade being real plush; but not sure what the current Blades are like.
Angell K7; anything Angell really
My stringer swears by Volkl for people with TE so could be worth looking there. Just stay away from Babolat.
Strings:
Syngut, Natural gut, and Lux Element aside, stay away from all the other strings you've listed. And stay away from any other Lux.
Try a multifilament, or if you want to hit with poly, do a nat gut mains/ poly cross hybrid. RS Lyon full bed @ no higher than 50 is probably the only 'safe' poly option I can think of.
Yes technique is important, but you are going to need a setup that allows you to play pain free while you develop that. Good luck.