When I setup preload with a hydralic cam, I do it with the intake removed. Not all rockers get the same amount of turns, there all different depending how much preload they need. Again, there never all the same!
Watch the plunger in the lifter and give it enough preload but not too much. Got to watch the plunger and who cares how many turns I have at the rocker arms, just as long as it within reason so the oiling is good.

Your'll never get it right now without pulling the intake and setting it up by sight. And who cares how many turns you have!! You have to see the lifter to determine wether the plunger is up or down in the lifter when you set it up.

I have been running Crane gold rockers on both my cars for 20+ years now.340 and 440