How to undo the damage Razer Cortex has done?

I got a Basilisk Ultimate earlier, and I was extremely excited about it. I installed Cortex at the same time as Synapse, and after tweaking my preferred mouse settings, I took a look at what Cortex was all about. I 'optimised' my rig, and this is ultimately what I'm hoping to undo. Initially the app was causing weird freezes - when I opened a boosted game (Far Cry 6 in this instance) it would freeze but I could still move the mouse, but I couldn't select anything, and whilst it let me open the windows menu it wouldn't restart or shut down. It also looped any audio playing at the time of the freeze at about a 0.5 second interval eternally. I had to manually shut the computer down several times, as every time there was just nothing to be done. I found this thread from 2016 where they have the exact same issue, and Razer Cortex was the cause: https://forums.tomshardware.com/threads/i-keep-getting-werid-freezes.3677303/ After several restarts I uninstalled Razer Cortex, as this fixed the issue for the guy in the thread. However when I run Far Cry now it skips a few frames every second, at exact 1 second intervals, like clockwork. It ran perfectly before. I verified the game files and it found several that had been corrupted (presumably by Cortex) but after replacing them the issue remains. I've just uninstalled and reinstalled it and that hasn't worked either. I reinstalled the latest GPU drivers, but I'm not sure what to try next. Whatever Cortex has changed, it's remained that way. So what I want to know is; is there a list of all the things Cortex does so I can go and methodically undo them all? This has been a huge pain, I've been at this for 6 hours so far, and this has really soured the joy of getting the Basilisk Ultimate. Any help is massively appreciated.