Well Al you nailed it and it took about the blade width of a medium screwdriver.....1* roughly. I jumped out of bed and was on it before the sun crested the horizon. The pump limit allowed the rpms to increase to slightly above where they were telling me that i went the right way besides the smooth and much quieter running......considering a 4.4" diameter pistoned, 3 cyl., 4 stroke diesel.
In reading the A&I serv. manual, it said that some people hook the tractor to a dyno and tune the timing for max output which supports my assumptions about the manufacturing settings being "within a range" and not necessarily right on. Understanding that the production line has to keep rolling to make a profit. One wouldn't expect workers to sit there and play with timing to max out the HP on each tractor.