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"if we keep doing it the same way we always do..we will always get the same results"
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Pull the snap ring out of the lifter, pull the plunger, remove the spring, and install 2 #10 AN washers in place of the spring. Put the lifter back together without the spring. You just turned it into a solid with a little room. No guessing about cup heights or "is the plunger moving" It will usually have about .075" of lifter plunger depression. This is your lifter pre-load. Usually equals about .5-1.25 turns of the poly lock, once the spring is back in, depending on thread pitch and ratio. Check with light springs at the valve if you want. Follow the video. Dont forget to put the lifter back together!
I use a dial indicator and low tension valve springs to find max lift and piston to valve clearance. Just put the plunger on the dial indicator on the edge of the top of the retainers and rotate the motor till the indicator is at its highest reading to find max lift. With the lobes on max lift, I preload the indicator (about 200 thousands) then zero the gauge and press the valve down till it touches the piston to get my piston to valve clearances. Hope this is helpful! Mark