You need a reset in your main's macro.

You don't need help with target=player. Aside from making the macro longer it doesn't hurt though.

It would be easier to just target by left clicking instead of using /target mouseover since your mouse is already over them.

As is, you need to press the key 3 times to get the alts to heal the same character if you start with nothing/an enemy targeted. First one targets their selves, second one targets your target, third one casts rejuvenation. The main starts healing on 2. Not a big issue as you can just press, wait, press twice, and be almost in sync.

The main has no way to heal itself without telling everyone else to as well, so your heal everyone method skips the main.

You can replace FocusTarget with Party1Target, or any other main assisting methods if you don't use focus on your main.