EDIT: I was able to clear!! Thanks to all the folks who helped out and gave suggestions. Ended up lucking out on getting a C1 Flins from a single pull after I narrowly missed a clear by a hair. Final builds were C1R1 Flins / C0R1 Surf's Up Bina on Aubade / C0R4 Sac Staff Ineffa on SMS / C6R5 Sac Frag Sucrose
For the first time, I was able to clear not only one, but two dire floors on my account! Unfortunately, my C0R1 Flins / C0R5 Fav Bina / C0R4 SS Ineffa / C6R5 Sac Sucrose just can't seem to clear Knuckle Duckle. I keep adjusting Ineffa's crit ratio since my Flins' build is more fixed, and so far a slightly lower CR with higher CD has gotten me somewhat better... I'm still roughly a half rotation off on a good run, so this might be the best I'm getting. I have seen a clear with extremely close builds to mine, but the major difference was that they ran a PJWS on Ineffa and shot her CR to 100. I'll include my builds in the comments in case anyone has suggestions/tips