My one experience with Hughes rockers, and it was the older version without the slot down the middle.......
Std offset BB rockers, EZ heads, 1.6 ratio.....just under 1.6 with a checking spring, about 1.51-1.52 with 600lbs of spring load.

My experience has been that Cranes are usually about .05 higher than advertised when measured with a checking spring.