I think this time of the year it's important to consider ambient temperature as well. I'm beginning to think I need to re-do my mount as well. I was planning to experiment more and start another thread, but if the OP has similar questions I can start placing data here.
Ambent for my system runs 23-25c. In HWiNFO64 my "idle" temps (this would include general web use, GPU folding etc, but nothing demanding) range from 43.5c to about 65c. In delta T that's 20.5-42c. This is in stock configuration. My cooling loop is set to run at 36c, so 11c-14c delta. Now that the air is on, I think I should probably bring this down to the 10c delta that is my goal. Running Prime95 Small FFT I reach 85c or a delta of 62c.
Now it's important to also consider that each of our chips is being subject to a different amount of voltage and current when we are taking these measurements. In the case of myself and trents, we are both subject to the same limits. Merlin's 3600x, however, can actually draw more current then our 3700x's (see the following link to reference stock values
https://www.gamersnexus.net/guides/3491-explaining-precision-boost-overdrive-benchmarks-auto-oc). Kenrou's CPU has a fixed voltage that is actually pretty high for an all core load. I just say all of this to clarify that we should not expect true apples to apples performance, but I believe we should all be in a ballpark. For example if trents' delta T under load is greater than 10c different from mine, then I think it's safe to say there might be something going on. For Merlin I think it would be beneficial to check temperatures under a load like Prime95 SmallFFT. I think it we move towards collecting data we should also record ambient temperature, SVI2 core voltage, and PPT, TDC and EDC readings.