Let’s get some basics nailed down that can’t be disputed..
1)
Your lifters as you have posted have about .050” of adjustment range that they will work in just fine without noise if there made right.
2)
as any motor heats up any dimension that was a clearance will close up some and other will open up.
3)
As valve seats bed in and ware over time and valve stem tips and rocker arm tips ware what might have been a no gap / clearance condition will develop a gap.
4)
Aluminum heads will typically grow about .005” to .008” when up to normal operating temp, and iron heads will grow about 1/2 that amount.
Basically all you are doing when adjusting a hydraulic lifter is providing enough room for dimensions like above to change while maintaining a no clearance condition and also keeping the plunger from coming up against the clip ( be it round or flat C type) to hold the plunger from exiting the body of the lifter.
So basically you have been told in your corespondence that if you have a given push rod length that gives you good geometry at half lift then a push rod .020” longer will have the plunger compressed .020” out of that .050” you have to work with .
This is fine and as dimensions change when the motor is hot and things ware some you should never hear a clacking lifter or rocker.
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