I have it at my grade all the way to S+. Been that way since i was at the lowest grade. I like fighting people either my rank or higher. Just a preference.
Ranking up would be easier if it didnt take so long to match make. Especially sucks when i cant beat a guy and i get matched with him 5 times in a row.
Yeah, the other reason why broadening the field helps your rank up potential. But it is better not to for the soul, hahaha. Signed, one of the already damned. (Damned S- on PSN! And I bet you are way better)