Pigs can clip a clean channel, yeah. If you have a clean gain, use that, if not, roll back the volume. Their clean sound is great (not "for a metal pickup" its just great).
The pig can handle the lowest tunings I've thrown at it - drop A, no problem. Its not all that tight (rather a lot tighter than a nailbomb though, which seem to have about 'normal' tightness - most BK high outputters are much tighter than you'll be used to playing, and the pig is middle ground on that scale) but its easily tight and clear enough to take a low B/A. More, I daresay.
Dont believe people that tell you its loose or dark. Its niether.