doesn't make any difference what rockers are used; preload factor remains the same. the question may be is "there any adjustment in the valve train?".
That was the point and it's obviously going to make a difference in how he increases pre-load. He said he had custom pushrods made to achieve his desired pre-load.
If the pre-load is 0.020" now and it bleeds down enough to be noisy on start-up after 6-7 hours, how long will it take to bleed down with pre-load at 0.090" ?
The lifters are bleeding down fast. Is air-entrainment an issue? Sloppy clearances in the lifters?
