@SharonC - To answer you initial question, in short, yes, the Auxetic Radicals
should, in theory at least, be more comfortable than the Graphene XT, as the XT was known to be very firm, crisp, crackly, vibration-propagating, and arm-unfriendly, across several of Head's silo, Radical included, and the Auxetic versions, while not a panacea for everyone, should be at least a partial step in the right direction, as their feel is noticeably more muted (especially Auxetic 2.0).
That said, I know this might not be what you want to hear, but it may be what you need to hear: unless you're making serious money playing tennis, playing with a racquet that gives you pain, even in the slightest, isn't worth it. Presuming you've tried all the string adjustments (gauge, tension, more gentle material, etc.) and customization (namely adding recoil weight), then you're probably best off finding something else, even if it makes some of your shots less effective. Additionally, if you haven't already, I would integrate physical therapy/training to help heal and lower your susceptibility to future pain. Or, if all else fails, simply take time off from tennis for a while, to fully heal, free from the stress/trauma load.
Getting back to a solution, looking at your first post from 2018, I see that you were able to find at least passable-enough comfort with the Prince Original Graphite, so perhaps you take a look at a current Phantom, a ProKennex or a Clash v3. Again, perhaps not the sexiest options in certain ways, but if they allow you to at least play tennis, pain-free (or significantly reduced), then priority #1 is accomplished, and every else can be increased after the fact.
Hope some of that helps.