Generally speaking (no stats) I'd be folding this. I'm pretty sure it's my major leak in micro stakes. I'm so use to not giving credit that even when I'm slapped in the face I don't even notice.
I know it's only 6max, but with a pf raiser RAISING a pf callers donk bet, shoving just seems too strong. He could easily be doing this with any set. I think the only hand we really beat here is 99, 67, XsXs, as I think most probably 3bet TT ip. We may get bluffed here often, but I think there are much clearer profitable situations in 25nl