Ughh yeah that sucks. I mean in general for most people. But I place tennis elbow comfort in a completely different category.
Have you tried that trick with the rubber bar? Or something similar? I think it could do wonders. Takes time and rest though.
I had a kinda mild case myself I think. I do not believe TE is a repetitive stress injury btw. Not normally anyway. One night or a couple with one or a few bad mishits is enough. Even if you normally play with poly and seem fine. Made the mistake of trying to play with old RPM Blast in a new racquet on a cold night once. I was struggling with the setup and thought how bad could it be for one night? I was also kinda curious. I played with poly before, even old Alu power. Hit it near the top of the frame, pain flared up instantly. Continued to play the rest of the night with it. Pain was bad, but not overwhelming. Came and went the next few days, nights, weeks. Never went away on its own.
My TE is basically under control now, but I only play regularly with hybrids. I've always liked a plush rather than crisp feel. I would stay away from any racquet above about 62 RA unless you had some silicone or other custom dampening in the handle. Or if you use like a Pro kennex or Prince O-port racquet with a multi or nat gut hybrid. Once you have TE, unless you've taken steps to try and heal it, anything remotely jarring can begin to aggravate it again.
Hard to describe unless someone had a physics background, which I don't. Racquets that are comfortable for regular people still transmit shock. It might be dampened. So much so you can hardly tell, but your TE arm can. Tecnifibre is seeming to look at mostly stiff yet slightly dampened racquets for power and response but not Babalot uncomfortableness. Think of them like a mini-babolat but with much better feel and comfort in general. Still not nearly good enough for TE though.
If it's still flaring up, especially during play, I would begin to try and let it heal first, with rest from play, rubber bar type exercises, then gradually starting tennis again with a comfort-oriented racquet, and always before and after play whenever you can, warming up and then down that arm with similar exercises.
The Prince O3 series, maybe Phantom, most Pro kennex, 360+ Prestige Mp, Vcore pro 97HD, and Blade 98 v7 would be a good place to start. Maybe the new Dunlop CX 200 series.