Now the problem is this: if you open up the idle air bleeds to give you more control over your curb idle, your 40-50 mph cruise will be too lean, and you'll run into surging. It's almost like you'll have to try some combination of smaller IFRs and smaller air bleeds to try to make it work.
Your cruise on the mains is quite rich. More than likely, you'll have to step down several jet sizes if it's cruising at 12:1. I don't think just bleeds will clean that up. Then you have to worry about your power AFR, so you'll likely have to open up your power valve restrictions. As you can see, this is a long process (and sometimes expensive if you're buying jets and bleeds).
