I'd be interested to know your reasoning why you think BPC could be beneficial with Perceptual. The results I've seen don't seem to bear this out.
The rendering intent should be immaterial. Now I don't know who's profiles you're using or how they are handling a Perceptual intent. There is absolutely no standard in how a manufacturer builds a perceptual rendering. To Quote myself:
Because there is no standard specification for how ICC profiles map solid black from the source color space to the destination color space, there are cases where the solid black of an image can produce less than solid black in the resulting converted image.
To correct these possible problems,Adobe has a switch in the ACE CMM called Black Point
Compensation. Turning this switch on causes ACE to ignore the actual luminance of black in
the source color space.With this switch on,the darkest black in the source space is mapped to
the darkest black in the destination.
So, is there a compelling reason you don't want to map Black this way? I've seen some wacky RGB profiles that produce poor results with BPC but I haven't run into one in years. As I said, if there's an issue with the black mapping, BPC helps. If there isn't, it does nothing. If you uncheck it, you'll either see no change, or you'll see why you generally want it turned on.