I've had a couple of ERN's, and mine have been first class shavers. I used my normal progression - set the bevel on a 1k and progressed from there. For some that was BBW/coti, for others nani 5 and 8.

I would say +1 to trying out your next finest hone to see what that does. I don't have any calibrated tests for hones under 1k because... well because I have much more experience on a 1k than below it and I know what I want a blade off the 1k to do.