Hey Bradykinn. Welcome to the community. This is about what you can expect from the forums here. You ask how to solve a problem, and half the thread will be about why you shouldn't be doing it in the first place.

That said, I don't have an answer either. The few healing macros I've used have all had a lag to them. I haven't found a solution yet, and have had to retrain for fkey targeted heals.