Lifter Preload??? Factory spec???

I run the 1/2 turn, now.
I used to run 1/4 turn but that was no good. A couple of weeks later, I would tighten one and then a couple of weeks later another and so on until several were 1/2. So I just caved in and set them all to 1/2turn. Never had to tighten any since. If I told you that was a decade ago, would you believe me? Ok I'll tell; a couple are noisy again but I don't care.......lol