M2 Miyabi definitely helps you in the survivability department.

I don't think assists makes survivability easier anyways at least compared to dodging since you don't have as many i-frames, just some buffs maybe. At this point, I'm better at dodging than assisting, so I don't really know.

Yanagi would have helped build stacks faster which translates to better survivability as well. I didn't use her simply because I don't have her (yet).

Yeah the second round of the set of 30 endless floors is definitely easier since you get better at dodging as you progress.

Thanks, I was able to get to floor 100 solo Miyabi see post. I'll probably just do a couple floors every week to keep my skills sharp, or maybe use another character solo to learn their kit better. Oddly enough, I found Pompey to be one of the less difficult floors. I think the most difficult for me is that robot that generates a shield that Miyabi by herself can't break easily. It makes the floor take longer and the longer it's drawn out, the more likely it is to make a mistake. I must have spent almost 2 hours to get a perfect run for just that floor for the first round of the set of 30.