I've found that the JO Rocs have a shallower rim than the BB RC3's and Proto RC3's. I think they did 3 or 4 runs of the RC3 Rocs.
Life is better lived than conceptualized. This writing can be less demanding should I allow myself to indulge in the usual manipulating game of role creation. Fortunately for me, my self-knowledge has transcended that and Ive come to understand that life is best to be lived not to be conceptualized. If you have to think, you still do not understand.