Just want to follow up on this issue and say that I decided to upgrade Revive, thinking that maybe a fresh install would solve some of these issues. While I was upgrading Revive from version 3.x to 4.0.2, I hit an issue with not being able to access the admin dashboard due to Varnish cache. I jumped on a chat with Dreamhost about the limitations of their DreamPress product and found out that since it's a managed WordPress type thing, they don't allow any 3rd party tools or software to be installed in a subdirectory, which is why my statistics stopped reporting after the server switch. Thankfully my old shared server is still accessible, so I plopped a new instance of Revive on there and the migration/upgrade process went swimmingly and now I'm back up serving ads as good as new.