John,
Short version of what you are saying....Topping should be done for the normal conditions the aircraft is going to be operated in....Altitude, OAT?
Meaning to me.....a machine at say Newfoundland working offshore to the rigs from a sea level heliport in the Winter time would have a different setting say as for an aircraft working in the mountains of California in the summer....say 5,000 feet and +25 OAT.
Am I right in what I think you are saying?