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I was told by Hughes that the lifter I bought from them likes a lot (.08") of preload, hence 2 to 2.5 turns.

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Which rockers are you using? The reason I'm asking is on most adjsutable rocker arms the adjusters are 3/8 diameter with 24 threads per inch, which means one full turn is .042 at the lifter, the rocker arm ratio multiplys so I normally try 1/4 to 1/2 turn preload and then drive it some so the lifters get a chance to pump back up from adjusting them. If you have the stock late model rockers like SB Fords and Chevy disregard my procedure