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My car is still running lean in mid range and load.
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William,
I was talking with Steve Weiner this afternoon and he mentioned the exact same thing. At WOT, CIS will tend to lean out in the mid range, richen up a bit as the RPM's increase and lean out again around 6000 RPM's. Looks like this is the nature of the beast.
Increasing system pressure or decreasing control pressure will richen the mix throughout the whole range. There is really nothing you can do by modifying fuel pressures to compensate for a lean mix at a specific RPM w/o affecting the whole curve. The a/f curve (a/f mix at a specific RPM) is determined by both the fuel distrib and its corresponding mixture control unit.
Tuning tips:
13.2 is the magic ratio for max power output.
Anything above 14.0 is too lean. Anything below 12.8 is too rich.
This is all at WOT.