Never technically got to main MNK, but I figured out the trick with PB and AoE pretty easily, and without a guide.

It's not so different from BLM AoE, in that you need to build up a little before cutting loose. Get to GL2 or 3 first, then pop everything, including PB, and drop Rockbreaker like there's no tomorrow.

Don't have any numbers on file, since that was months ago at lower-than-current ilevel, but it was a match for a BLM. Except for that three-minute CD.