My own experience with pulling maxed out cards is that what happens has little or nothing to do with luck and almost everything to do with how you entered Chance Time. Maxed cards give out pero if Chance Time is entered during slot rolls. If Chance Time is entered by using up a Gacha Ticket, then maxed out cards will level up a different card instead.

It seem they changed Kurite so she can drop 2 girls at same time. Fx N-Girl and R-Girl or RS-Girl and N-Girl.
N-Girl was hardest girl to get before update which not intension I think.