I agree that those 42lb/hr injectors may not be too fun at idle. I've heard of lowering the fuel pressure at idle to compensate for overlarge injectors on an engine. Maybe if you setup up your regulator some how so that you dropped to 25psi or something low? You'd probably lose something as far as spray pattern and what but maybe it'd help with idle? Not sure.
I see a problem with running the stage injectors too. Since you've got an injector on each side of the port if you just shut one off you might hit some real distribute issues. Which is it's own headache.
