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Olympiadis, I agree with your conclusion about throttle restriction. I would assume the reason why most here do not go the route of custom tuning and or running at higher than 14.7 to 1 ratios is the huge spike in NOX emissions you see when you go to more lean ratios.
That's what killed the 92-95 Civic VX as far as Honda continuing to use the lean burn system with AF ratios as high as 25 to 1, although they still made lean burn systems after 1995. In fact the original CVCC carbureted system was a type of lean burn, starting back in the 1970s.
Custom tuning is great and you are finding that there is definitely room for improvement over factory settings. Honda even went as far as to use primarily one of the two intake valves to increase swirl for better consistency in the air-fuel mix in the VX in lean burn mode.
Check out Homogenous Charge Compression Ignition for some more information. A lot of research has been done with some of the same apparent issues you have brought up about ultra lean mixtures and load sensitivity.
Open loop basically goes outside the paramters of factory design and most likely creates emission issues that are unresolveable today. That does not mean they will be unresolveable tomorrow, so keep up the good work. Just remember that there are legal issues with willful alteration of emission components, if that applies in your vehicle.
Not meant to be argumentive, you are just going to see a very small percentage of members here who consider emissions as secondary to function.
regards
Mech
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