Just a little Karabita I drew for practice tonight to see if I'd gotten things in working order.
Thank you everyone who offered advice on trying to fix the issues with my new tablet and art software. After uninstalling the Wacom drivers and seeing the problems with Adobe persisting, I determined it was likely being caused by the OS upgrade. So I restored the computer using a back up from before I upgraded the OS, reinstalled the Wacom drivers and everything seems to be working okay in Photoshop anyway, I haven't tried Illustrator yet but I think this is a step in the right direction!
Hopefully my laptop won't force me to upgrade the OS anytime soon as it seems like Mohave doesn't behave with my art programs...
Thanks so much for bearing with me. This has been a bit frustrating but I'm really hoping I've got things worked out now and that I can get back to work!