214A doesn't do 1600 base, though. It could be like 3k with 0.0001 P1 on first hit or something with a minimum damage of 1600. Similar proration could be possible with Fenrir. When the combo starts from 5C, you could be just ignoring the bad P1 from the first hit of those moves and only applying P2 and combo rate.
EDIT: Obviously those numbers I gave are wrong, though, 'cause that would make other stuff not make sense.
EDIT: Do we actually have the complete frame data for 1.1?