How can I improve FPS on triples?

Recently upgraded my rig to triple 27" 1440p. I was previously playing on a single 4k screen, reaching a steady FPS of around 90-120 (+60 in rain) when everything cranked to high settings. Now, with everything set to low settings, I cannot even hit 60-70 FPS consistently. Start of a race is around 40'ish FPS.

Now I know that AMD is not optimized for iRacing but I did not expect it would be like this. Below you can find my computer set up. Anything in particular that would need upgrading to increase the FPS? I know going for a NVIDIA card is the smart way to go but spending around 900-1100 for a used 4080 Super will not happen in the near future. Would upgrading my CPU help much? I've read that iRacing is pretty CPU intensive.

My rig:

CPU: Intel 10900K

MB: Gigabyte z490 vision D

RAM: 32GB

Storage: 2TB SSD

GPU: AMD 7900XT Reference Card