Lonnie,
We are on the same page here. That .004" measure is a MAX value, the .002 a minimum. Since the clearance tends to grow with normal operation, adjusting to the lesser value makes good sense. During break in I prefer to insure that the clearance is not approaching the or exceeding the upper limit. Just good operating practice. As I said a few days ago, I have never set a Saito rocker cover over a rocker that was adjusted to .004"
That .002" clearance provides room for a healthy oil film, more clearance is not "better".