[Gaz64]

Wayne,

As Rick has asked, what rocker stud thread pitch have you got?

My maths says 2 flats is not enough. On a 24 tpi stud and rocker ratios in the 1.5 - 1.7 zone, 1 turn on the pozi-lock nut equals roughly 66 -70 thou, 2 flats gives you 22 -23 plunger depression.

I'd say you're ok to leave them where you have them, some people run anywhere between near zero preload to 3/4 turn.
With that in mind, you're just short of the mid-point.