Hi
I use Perceptual and BPC 'On', but the best way is to try the alternatives out for yourself. Place two (or more) copies on a page, right-click on one of them, and choose 'Custom Color Management Settings'. You can then change the settings for that copy and see the difference side by side.
Boy! Do I feel stupid. Why didn't I think of that myself? Please pretend you didn't read my post until...next year or something.
Following your adwise, I printed four copies of an image on a single sheet of paper, all with different color managment settings, but I am unable to tell them apart. So, quality wise, it seems that there's nothing to gain by changing Rendering Intent and BPC for B&W prints - at least on my system it isn't.
Thank you for your help.