I have used PMK since 1994, wow, so for a while now. I usually double the exposure of the box speed with the usual caveats. There are many variations of staining developers, but this one has served me well and I'm more in to making a great image than testing developers my whole life.
I rate my fp4 at 64 (close to what chris does) which is about a stop less than box speed. There are times I rate it much faster though and develop the hec out of it.
My times are 12 min at the above temps in a rotary processor. (mostly 8x10 sheet film)
I would simply recommend doing a test roll and seeing if you like what you get.
One can get a great negative from just about any developer, it's a mater of getting to know it.