Update - I think that for whatever reason when I removed the printer it wasn't being properly uninstalled. When I examined the port to double check the IP address, I saw that there were multiple ports with the same IP address followed by _1, _2 etc. corresponding with the number of times I'd "uninstalled" and reinstalled the drivers. However, when I removed the printer ONE LAST TIME these ports disappeared - weird. I reinstalled the printer again and it works now. I still wonder why it didn't remove the printer properly the other times, but regardless its fixed now so I'm happy!