Couple of ways to tackle this.
1- don't send assist to the healer in the first place (change the Action Target Groups)
2- use focus, party1 or named conditions in healing macros

I'd like to get a better understanding of what your click bar is doing for you etc.
And how you want to heal with your character in general.

Reply here or check out the ISboxer Discord. https://discord.gg/XpsksC5


I use a combination of things, overkill to be honest.
Healer macros using the focus/party1 set up as well as a repeater region over Vuhdo.
Works for me at least in 5 man content.