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Honeychrome--you've taken a much more scientific approach to tuning (as my son would at his Mini/BMW shop) than my own stumbling, seat of the pants experiments. When tuning, it's much easier to get it right if you go from rich to lean. Going the other way the car seems to run better and better--egging you on to make it richer still---wrong. Then you've gone so many steps too rich you have work to get back to the sweet spot. Going from rich to lean will make an overstep more noticeable--then back up one step. Your condition of leaning out on light throttle under load may be correctible by going a little smaller on the A/C jets. That's also the area that the emulsion tube plays a roll. I used to have the advantage of access to many scrapped cars for Weber hardware--and had accumulated a variety of jets, tubes, etc--with Weber guide in hand I examined the emulsion tube in a car with a similiar problem and a number of tubes on hand---picked a different profile-- solving the problem. Your symtom could also be caused by carb icing--an often overlooked factor. If you don't have some warm air already directed to the intake, try doing so--heavy duty aluminum foil and some appropriate tubing will work temporarily.
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