1983 308 QV and Colorado Emissions

First, anyone else have a hard time getting the test done? Repeated dilution failures, but ultimately passed all but HC. Was running rich at this altitude, so figured, but 10x limit at 2000 seemed a bit much. Found the thread on adjusting the injector premix (yes, they really did mean very, VERY small adjustments…). Got it a hair off stall at idle, smells way better, retested, same 2000 measurement? Something is off. Ideas?

 

(Face palm) This might explain why it still feels sluggish (rich), yes? I expected some elevation hit but this feels like too much, getting beaten at the line by a Prius is making me sob between shifts. Thanks for the recommendation, I have scheduled work with Maranello Motorworks (thoughts, past experience anyone?) but would like to sort this out sooner for the sake of registration.