Talkwrench (7/9/2018) "Its like words from a higher power"....

LOL, well I try to help but, as far as divine intervention, as they say, "your mileage may vary".
I took a closer look at all the original rockers after replacement and what surprised me was how what appears to be even just a small amount of wear on the face can interfere with accurate lash adjustment. A few thousandths one way or the other probably isn't the end of the world but getting them all consistent makes for a smoother running motor.
It may be the wear and galling that's typical on the rocker bores and shaft has an outsize effect. All the slop or excess clearance has to be taken up before anything moves. The "1/4 turn" allows for some of this, but not all of it.
With fresh valve springs and the new rockers, shafts, pushrods &c I realized a 5 to 10 psi compression improvement in several cylinders, everything is evened up now.