This is how it usually works out for me with fast rate HFT cams.
What brand and part number lifters are you using?
Another issue that often arises with HF lifters is, and it’s not even a fault of the lifters........ entrapped tiny air bubbles in the oil that diminish the ability of the lifter to function properly.
Some oils are just better at releasing entrapped air than others.
Solid lifters eliminate that as something that can affect valvetrain functionality.
Here’s a 360, pump gas, bowl blended J’s, small solid cam:
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