Pooping issues due to tight pelvic floor?

During a bowel movement, I feel as if the stool was irritating my entire anus as it passed through. As if it was covered in tiny thorns. It's not a strong pain, but it looks like that every time. Afterwards, nothing is wrong with me, although sometimes I get a stabbing pain. I've been to a good proctologist and he can't see anything in my anus. Can tight pelvic floor muscles cause such symptoms? Has anyone had this?