Is "focus-target" a valid command? I always throught it was 1 word "focustarget".

Are you sure your other slaves are setting your focus target correctly?

Sounds to me like your macros are not correct, your focus is not setting correctly and you are getting your target on the first slave via tab targetting. The other two are casting HW because they are targetted to your main {"help"} from your autofollow macro, probably.