Guys! you have to remember that the hot spot doesn't come only from core and that is why is so difficult to fix it permanently. Hot spot comes from die and VRAM. You can put TFX on the die and if the pads on VRAM melt enough to lower its height, the heat will either accumulate underneath because the pad is to low or pads are to high to begin with and paste eventually lower itself due to heat and is the same effect..High hot spot.
This is so difficult to fix, even manufacturers can't, so ultimately when you do it and TFX is definitely the best paste, eventually goes back to high temps regardless, just a matter of whether this will happen within days, weeks or months, but it will happen.
When I did my Strix 3090 for the # of time I finally got the hot spot to stay at 14C for I think almost a year which is best I made thus far, but I know it will degrade sooner or later.