I have a similar issue to yours.
Are you running on a PRIME setup? Otherwise, I feel it might be a different issue with similar symptoms as my old PRIME setup seemed the cause of the issue for me.
How can I check it’s running on nvidia 430xx and not some default drivers?
This can be done with inxi -G, but it won’t be running until the reboot, so it won’t be visible until then. MHWD seems to be rather useless after manually compiling older drivers.
If I do manually install the drivers, I want to make sure they are properly installed before I reboot since I don’t have physical access in case something goes wrong.
Aside of checking packages and config files and such I don’t know what else you could check without actually rebooting to run the new drivers.
There was a tutorial pinned at top of the forum when the drivers just changed that told you how to manually compile drivers newer than the dropped legacy ones but older than the newest, like the 430xx drivers. Worked like a charm. But I can’t find it back so quickly anymore and the pinned message is removed. I did copy-paste it when I was struggling with it myself tho, it’s in the solution here: Update broke nvidia, can't boot