i thought id simplify the ui and refer to them all as relays. you can disable the https proxy when adding a relay, see screenshot. which lnd port did you choose and what did you select in zeus? for the error that youre seeing, make sure magicdns and https is enabled in tailscale. 
adding an issue to try and check for it from the tailscale client and report it in the ui
Tailscale
Enabling HTTPS · Tailscale Docs
Configure HTTPS for devices in your Tailscale network.
