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if you had a car that ran nice and cold, but its main operating spec was climbing a hill while towing a trailer for 4 hours at full throttle and emissions were not a concern... that's how you'd tune it too. like a big RV. a bit rich, and conservative timing.
I have tuned RV's and tow rigs. And I have worked on both carburetor equipped and MEFI equipped marine engines. Unless engine configuration prevents it, I never choose to release a calibration that is so rich it burns your nose. That is rarely necessary when you have a degree of confidence in the owner / operator's ability to stay alert to the situation and in the system's ability to work consistently within design parameters. In this case (OEM Cals being so rich) fuel quality was suspect.