The roadshow independents were not part of the Hollywood Studio system.
http://en.wikipedia.org/wiki/Production_Code
Local censors caused the exploitation filmmakers problems, not Hayes.
You want to tell me that Russ Meyer’s Immoral Mr. Teas was submitted for “Hayes Code approval”?
Of course the link you provided doesn’t even mention roadshow movies. But I do know there’s a DVD release of Marijuana Devil Weed out there that has a commentary by one of the guys who used to show those kind of movies and he discusses at length how they got around various censors including Hays. There probably were many that just avoided Hays completely, but others didn’t, and specifically the “morality-movies” were designed to be able to deal with Hays and still cater to a smut desiring audience.
By the time Mr Teas came out Hays was finally starting to collapse. Otto Preminger was already getting movies out and successful without Hays certification, the writing was on the wall.