This is precisely what I've been saying. When all things are equal (reviewer testbed etc same CPU) there is an increase in FPS, to the levels in the chart above. To say otherwise is misleading.
I would agree that at bare levels (low in game settings etc) that the increase is much more nuanced. But there is still an improvement from going from a 3060ti to a 3080. The difference is not only down to reduced mem latency.
Again, Ill give my own example. I've a 5600x, and a 3060ti. I would expect an increase in FPS at a given resolution, with set in game settings to compare with. I can pretty much guaranteed there will be an increase in FPS.
By your logic, only in certain scenarios (ie low settings - 720p) your assertions are correct. But outside of that, with any eye candy on, or increase in res, then the opposite is true - the new GPU should yield more FPS. Yes/No?
I'm 100% with on UBM. As I've already mentioned, it's useful at best as a comparison, and can point out some simple stuff to use as fixes. As one of the other posters said, whether or not the mem is running at XMP/optimum. Yes, you can find this out in other ways, but the point being is that UBM is not completely useless.
The OP's CPU is not a 6 core CPU running at 3.7ghz. It's more often than not running at much faster boost speeds. And with that, and on top of a GPU upgrade, there should be an increase in FPS.
Now, just to be clear, I'm not for a moment recommending the OP upgrades their CPU to give them more FPS. I'm just stating things as I see them, and as the charts in multiple reviews of many GPU's make clear - That is, with all things being equal there should be an increase in FPS, going from one GPU to another one with more processing power.
Anyway, we really are digressing from the topic, and this should be focused back on a solution to the OP's issue, rather than us having a discussion, which neither of us are ready to give up on