Hi,
Not sure if my input will help in any way, but I too was underwhelmed at the start having got a 3090 at a good price.
COD cold war would barely go above 80fps, but turning ray tracing off would see it rocket to near 200 so was happy with that.
Other games such as squad run smooth with everything on ultra, though what the fps is I'm not sure, as I'm more a VR player, and that's spot on.
My system is also a 1440p one with a ryzen 7 2700x and gigabyte gaming oc 3090 (it barely goes above 60 degrees)
I've run several of the benchmark programs. The latest one being Timespy with a score of 15921 (graphics 19071, CPU 8224) It seems quite good comparing it to online benchmarks?
Again, not sure if that helps but it at least gives you a reference....maybe