Nope, two more 0402s on the output piggybacked above the bulk cap did zilch. Probably too much inductance for them to help.
I guess I'll have to live with a 3.4x reduction from the original ripple. Improved, if not as far as I'd like.
This is the last planned rework.
So I'm gonna pull the board and give it a nice scrub in some SWAS to deflux, then set it back up on the bench and focus on firmware dev from here on out.