I am sure this is easier said than done, but as it sounds like you are doing what you can with a speech therapist and exercises for him to practice, the only other option there is to check into another therapist (many have other great ideas and resources - more so than sometimes the school has to offer.).
Otherwise, as annoying as it can become~ I would give it up. You cannot control your son, and it sounds like he is having some issues controlling this.
Perhaps if you just let it ride for a bit, practice his exercises (w/o making a huge deal out of when he's loud, etc. with the tally sheet), read the recommend book for other ideas (and see if there is other researched information available on the web)... He may settle it down on his own.
I personally would rebel anyway if someone was tallying my faults. Wouldn't you? I too, would become tired of it. Put yourself in his shoes and look through his eyes to see what is going on. Talk to him to see if there could be more to it. (emotional, not just overly sensitive to the surroundings.).