If you read up on this issue there are or were hydraulic lifters with .060 travel, I do not know where to buy them, and lifters with .215 travel johnson is one brand. If I had .060 travel it would be no issue. Thick oil will cause problems, the experts say the lifter can only bleed down from the clearance between the plunger and the lifter body. If you Google lifter preload, everybody most recommend .020-.060, because hydraulics will pump up and cause pistons and valves to hit, and cause valves to hang open cold, so they run bad. If I could buy lifters with that .060 travel it would solve all my problems, or I will just buy a solid cam.
The only way a hydro lifter will pump up is if the springs are to weak, ie valve float, valve train instability at RPM, & at rpm with good spring they bleed down not pump up
