Yes I do have a wide band O2 meter. It idles currently around 10.7 to 11.5 despite having the idle mixture set for max rpm using a digital tachometer. I know the Weber instructions say not to turn the idle speed screw more than 1.5 turns, but It idles so poorly and shakes pretty bad unless I turn up the idle speed, which is probably exposing the idle ports like you are saying. I have the 32/36 DGEV, I believe the primary throat is facing outside the engine bay towards the driver side fender. Currently I'm running a 65 main idle, 55 secondary idle, 45 main primary, 50 main secondary and everything else I left alone. Also I had to increase the float height and switch to an electric pump because it was running out of gas quickly running down the highway at 3500 rpm.