I'm at work atm, and wont be home before tomorrow so I'm not able to test theese. However I can throw out another one you could try.

/targetexact Mezztaz
/cast [modifier:alt,help] Lesser Healing Wave
/targetexact Pipnam
/cast [modifier:alt,help] Lesser Healing Wave;[help] Healing Wave

Also make sure that you're not healing yourself because your alt-key is set for selfhealing. I'm fairly certain that my previous macro should work too.