Well, I am probably not the right guy to give you advice, as I practically leave 5 or 6 wrestlers out of every BTW Show. Hell, when I use one of those guys people think he is debuting. Just make your best out of the roster you have, and when you have a chance, and something planned for the wrestler, push him, repack him and make him a regular on your show. I have done that succesfully with people that wasn't regular on my show: Muhammed Hassan, Rikishi, Elijah Burke, Ricky Banderas(Messiah). Try that on you shows.
As for the PPV, it should be like that, not every member of the roster has to be in the PPV, not every rivalry needs to have a match on the PPV.