Eh, honestly with these DF groups the only thing you can really do is make sure you're standing in bubbles or next to the healer, or at least near them if you want to be healed. If you miss the initial star, don't stand in bubbles, don't stand in range of medica or fairy regen, then any healing after that is pretty much the healer being nice instead of letting you die because you're being a nuisance standing too far away refusing to be healed.

That being said, I don't 100% trust DF healers so I tend to pop my own mitigation/heals when it looks like I'm going to die to raidwides or unavoidable damage, difference being that 95 times out of 100 it would have been fine regardless of if I popped anything or not, but I still prefer to play it safe out of habit