was just thinking because its at a throttle shift and seems fine once it gets to full throttle, hows the PE enrichment rate ? desoot mode is disabled ? yea damn part throttle... im also using mechanical reg manifold referenced so just letting it do all the hard work, also see if its better or worse with quicker or slower throttle movement as it might just take a bit to keep up with the fuel demand as u were thinking, the pressure should be instant but the mechanical change in pressure may be slower to respondI already messed with transits to where it richens up on tip in. The lean condition persists for some time where I suspect it is a delay between the fuel pump DC modulation and the injector pulse width compensation - but you could have a point there.
I see the lean condition mostly when pump DC is not 100%. But, it's worth taking another look at. Part throttle can be so tricky!
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