Why is my FPS lower after upgrading to a Ryzen 5 5600X?

I recently upgraded from an i5 6600K (overclocked to 4.4GHz) to a Ryzen 5 5600X using an MSI A520M-A PRO motherboard. I've also replaced the thermal pads and paste on my RX480 GPU, which dropped its temperature from 90°C to 80°C. After installing a new CPU cooler, I'm curious if it might be applying too much pressure on the CPU. I removed Intel drivers due to some screen flickering, which seems to have stopped, but Windows is prompting me to update the Intel system drivers, although I left that pending.

While I've noticed CS 2 runs more smoothly now with no freezes, my FPS has actually decreased from 120-160 to 100-140. I expected a boost in performance due to no longer being CPU bottlenecked. Is it possible that I might have messed up my GPU during these changes, or would I benefit from a Display Driver Uninstaller (DDU)? Has anyone else encountered a similar issue or know what could be causing this? Just to add some context: my CPU usage is around 25-35%, which is an improvement from 100%. The GPU remains at 100% usage, but its temperature is 10°C lower than before. My RAM is running at 3200MHz (overclocked), A-XMP is enabled, and the CPU core is clocked at 3600MHz but can boost to 4500MHz during gaming. I'm not sure what's going on since I thought my motherboard couldn't handle overclocking.