Host name reverts to old after recompilation, SSH problem results

After a recent hack intrusion my VPS provider did a fresh system reinstallation with WHM 11.40.0 (build 26). The first thing I did was rename the host from what they had set it up as to host.myhost.com. Then I restored the email for all 6 of my accounts, after which I started setting up their SSH keys. I set up keys for 2 accounts before I realized PDO hadn’t been enabled, so I enabled it with EasyApache. Then I continued setting up SSH keys for the remaining accounts, except they weren’t working. Permissions seemed to be fine and the keys were being generated, but I was getting the usual "No Supported Authentication methods available" message. After a while I realized that for some reason EasyApache had reset my host name to what it was after the fresh reinstallation before I renamed it! I was sure changing it back to host.myhost.com would fix the problem, but instead it just changed. Now I’m getting a “Wrong passphrase” error when entering the passphrase in WinSCP. The same thing happens with PuTTY. I tried deleting the key and generating a new one, paying attention to the passphrase, but no dice. The same passphrase that allowed me to convert the private key to .ppk format did not work when trying to connect. It would be great to not have to reinstall the remaining accounts!