Not at once, trying to do 2 at a time by bashing then going on to my next skill.

But the iGCD thing you mentioned sounds interesting. So more than just the action lock, there's a timer of 1.3 seconds and trying to force two in at once is causing a couple of seconds downtime when activating skills?

I will admit, I do also like this macro particularly for speed runs, where I can activate all 4 before even engaging the enemy (On the approach) and start an overpower cycle. But in content where I need to actually be constantly using GCD's (End-game dungouns, etc.) I try to weave just 2. But I'll reduce it to 1 and simply add a /wait 4 line so that way there's no party chat, weaving 1 GCD between each skill for the self-healing cycle.