Probably removing the Optimus tools left some system configs it created in modprobe or another system folder.
I will search if you want to try again, how to properly fix the issue, I recall another thread I replied to long time ago with similar issue. It was about the DPI you can see in inxi for the monitor. This is something configurable.
//EDIT: maybe this? Everything is big on proprietary graphics - #2 by omano or source thread Nvidia Driver - Large Objects - #4 by omano