Some people want the rocker tip in the middle of the valve tip at mid lift, some want it at max lift, some have thier own secret formula. Take your pick, I'm not getting in that fight. If the lash cap helps you get it the way you want it then use it. But keep in mind that if you use lash caps and you bend a pushrod, break a rocker or adjuster then you have an extra piece of hard steel floating around inside your engine.

IIRC the H.S. rockers are about the longest out there and may infact benefit more than others from caps.

In theory, there is no difference between theory and practice. In practice, there is.