Glad you got it working! When you do a service install, you can adjust the TrayIcon shortcut in startup so that it has the --no-hosted-server option. When you do that it will connect to the service mode engine instead of starting up its own. That way you can still have a tray icon. Be careful though, installing a new version via MSI might reset that shortcut.
It sounds like you migrated yourself already, but here’s a good guide on the process that may give you additional pointers: Migrating from User to Service install on Windows - #46 by johnvk