There are timings, in full view, on this very forum for MJR that give 1200h/s on cn heavy at 1244/2125 570 nitro+ 8g.
Just keep looking.
Just keep looking.
Not even close to those speeds on public timings, post proof or it didn't happen.
The best published for me are those of Doktor, i am doing 1080h/s @ 1240/2150 on them, and even that is after hours of testing different settings and miners ( Nitro+ 570 8GB ).