Quick Fuel Slayer Rich!!!! installed LC-1 wide band

How were you "setting" the idle? Almost sounds as if you "didn't."

Adjust the screws with engine fully warmed at tweeking idle speed to keep it in range, screw them in slowly one at a time until tach or vacuum gauge drops, back them back out SLOWLY until the RPM/ vacuum "peaks" and then turn each of them back in "just a touch" until RPM or vacuum just barely drops "or doesn't."

What I'm saying is you want them "on the lean side" of the peak

You have to go back and forth with these a bit alternate.

If you have a huge / overlap cam you WILL NOT be able to get a decent idle at a fairly lean mixture. This is one reason "built" engines will never "meet" emissions