Here's are my temps:
I went over my notes, and doesn't look like I kept any temps for the Conductnaut, which is what I'm running now, and have had the best results with (or perhaps just applied best). With the Coolabortory Liquid Ultra @ 4.9 @ 1.35 volts I was at 74 c for three runs of Cinebench, and that's with my NH-D15. After delidding I was able to get 5.0 GHz stable, which I could not get before delidding. It would boot at 5.1, but I can't run any benchmarks at 5.1, with any settings I've tried.
So my temps improved, but I immediately noticed what appears to be corrosion, or some sort of change to my die. So I started with with the Coolabortory's Liquid Ultra. Then after some reading decided to change to Conductnaut, ordered, waited for it to arrive, then swapped it out. So roughly a week, week and half? I had the liquid ultra on my 7700k.
Picture of my CPU cleaned just before the application of the liquid ultra:
Less than a couple weeks later you can see the marks on it. These looks like corrosion in person, it was really weird. As you can see in my table above, it did not seem to affect temperatures. However, it clearly is doing something to the die in a rather short time frame.
I'm now four months in to this delid, and no change in temperatures, so I have not worried about it. However between that, now the chip needing maintenance every so often, not really gaining any performance to speak of (100 mhz), and a possibly shorten lifespan, I just don't see the reason to delid. I had temperatures that were acceptable before.