Hello Blair-
Thanks for reaching out, and I’m very sorry to hear about the loss of your rankings, I know your rankings are vital for the success of your online presence.
If you’re still seeing these errors after removing the plugin, take a couple of steps outlined here by one of the developers:
- Remove everything in your .htaccess file starting from # BEGIN W3TC to # END W3TC
- Remove the wp-content/cache directory.
From there, you should be able to re-install the plugin without any issues.