To the OP, that's about all you can do. I notice though I can cast normally using blink/blazing speed rotation to get back into the middle of the room and I usually take no more damage then what the raid is taking.
I don't know if it's optimal, but I keep up my bomb, spam scorch and then arcane explosion before my stacks fall off. If I have a missiles proc, I pop Temporal Shield and let it push me back while I cast it, then blink back up. I suppose if you have two procs, you could pop alter time, let it push you back while you do missiles, blink back up and do missiles again, then fight the current til alter time pops you back up front.
My guild struggles with he healing if get away lasts too long so i just do as much damage as I can and spam scorch, barrage while keeping NT up. Usually it looks like this, lei shi casts get away, I blink into her then cast an arcane blast with temporal shield up and then spam barrage and scorch. I do stacks aswell so if our warlock can't get them on the boss thern I ill just blink onto the boss and stay close.