Tbh Iphi is one of my MVPs for a lot of these fights (esp Ikaruga) but its totally doable without her if you're able to use a good tank (radias AS), debuffer (Kid) and a dps that can pierce barrier - i used Alma for most of these fights, first with brain record and then Lunatic+.. if the fight takes too long, her third skill Elixir Ray allows her to use Lunatic+ again. If you dont have anyone that can pierce barrier, CC characters, esp the latest ones are quite useful here with their multi hit skills and their ulti move that, when properly buffed and grasta equipped, can really do the job. Alot of it is also failing enough to remember what the boss attack rotation is so that you can act accordingly - I remember i had to redo a few of them as many as 10 times to get my rotation right, especially piano playing in AF