Been a while since I had a car with K-Jet, but I don't think there's any "official" way to manually adjust the mixture. It all comes down to the frequency valve, control pressure regulator, plus the throttle plate and fuel distributor and some miscellaneous other goodies. If these are functioning properly there are no adjustments to make. The one time I had a problem that came down to a mixture control failure it was the fuel distributor and I ended up replacing it with a pull. Have you checked the control pressure regulator and other ancillary bits?
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