JP-
what are your fuel #s during cranking? You might try closing the IAC a bit more for the same amount of fuel, then see what happens to idle quality & stability. How well does it transition from cold-warm-running temp?
IRT the leaning issue w/ greater pressure- was this open-loop, or closed? The injectors are supposed to be able to handle 75 PSI before overcoming the pintle or disc, so you should have seen a fattening, given all else being equal.
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