Chris,
This may be a dumb question, but is the EC-2 program knob centered on the potentiometer's travel. In other words, if you turn it CCW and it stops at 7 o'clock, and then turn it CW it should stop at 5 o'clock. If it doesn't, then you need to re-center the knob so the pointer is correctly referencing the true position of the potentiometer. If the knob has been installed incorrectly, you may think you have set it to go rich, when in fact the potentiometer shaft is still on the lean side. You push the button expecting one result, but you get the opposite.
Mark