Still running my 7700k, delidded but I did not use liquid metal, just some high end paste. I had one core running about 10C above the rest, brought that down to a delta of only 3C. Been under a custom loop since day 1. Not the best chip, but it has been running steadily at 5Ghz core with a 4.5Ghz cache. Still gets into the low 80s sometimes.
Plan to BIOS hack a 9700k into it sometime this year, just to see if I can. If it fails, probably just go buy a 5600X or wait it out for DDR5 if I can get the 7700k back in there.