I have my 2080 ti for a week now and it took me until today to tweak my fanscurves to my satisfaction.
So i feel you
🙂The most insight for me was to test how well my case handles prolonged heat.
I used the motherboard sensor to see how warm the case gets under gaming loads.
That let me to clean my dust filters.
Then i ramped up my case fancurve to a point that the sound was not distracting using my headphones.
No point starting with the GPU fancurve if your enviroment isn't at its best beforehand i say.
60 degree c seems a backed in plateau where the card dials down a peg in clocks.
My cards 3x80?mm fans run silent until 50 degree and ramp up to 1800 rpm until i reach 57 c.
🙂 I admit i cheat a little (see below)
For games that's it.
Benchmarks raise it higher:
70% starts at 58c
80% starts at 70c
90% starts at 75c
100% starts at 80c
Testing the fans at 100% i want to switch my keyboard and mouse for a RC Controller unit since it fells like something inside wants to lift off.
At least they run smooth at 100%. Yours will too. The Strixs fans have more mass outside than in the middle due to the ring. That helps with smoothing out low rpm but has a tipping point before 100% when they get unbalanced due to centrifugal forces weighing more heavily on that design.
disclaimer:
These numbers are useless for you i am afraid. They are catered to my case and my cold room temp:

The 180mm fan (running at 400rpm up to 1000) under the GPU is directly connectd with it since my GPU had a fan header.
The proximity lets me run that thing very cold with low rpm.
I imagine having to tweak again after my RTX and tensor cores wake up.
Good luck tweaking !