For players trying to link Embrace to your other heal simultaneously, there are two things that complicate what you're trying to do:

1) At 80% health, any player will trigger an auto-heal from the fairy. Your macro will be unsuccessful while a cast is already active.

2) The ratio of player to fairy heal frequency is 3:2, and variance in spell speed will not change that significantly. In other words, you will never get more than 2 Embraces for every 3 physick/adlo.

TL;DR: Don't assume you will always get an Embrace to stack with your current heal on the same target.