Yeah, Pinkladies isn't exactly difficult to kill (at least, her gimmicks are more bearable than those of the last EX Destruction), though she has very high HP (around 5.9M on top of the usual 10-15k defense like the other "Re:" shadows). My nuke party dealt barely enough for a one-turn kill, which was exactly what I aimed for on that attempt.
Correct, and it's maxed indeed, so Balsam and Hyacinth (random) were hitting slash. Then there are 2 maxed Kuroyuri FM (+15% crit rate each), allowing Hyacinth and Diamond Frost to crit at a 60% clip. Lastly, if you noticed, I hit the Solar Drive at the start of the Pinkladies battle to make use of my maxed Solar Drive-based memories, especially the 27% damage increase from Enishida FM (giving me a third damage multiplier aside from the boss and skill ones you mentioned). That's why I also had an idle third party (4 from my Solar Drive/Light Gauge lineup + Easter Chocolate Cosmos for Rainbow Panels) for the light gauge fill.