The coil fights aren't as high mobility as you may think they are. You can stick to the boss nearly 95~% of the time. The same goes for T5. Every turn in coil is melee friendly with every little interruption.There are very few mechanics that pause your dps over a few seconds.

It is all a matter of getting familiar with the fight, where you can move/position yourself, and refine your rotations. Take the time to understand and learn the mechanics, and figure out how you can use your gap closers and figure out what you can get away with as far as sticking to the boss as often as possible.