If it ain't wanting to idle down, sounds lean, or like the slide is gummed up. I'm guessing since you know the jet sizes, you've cleaned the carb right? Even with rich enough jetting, if your float Height is off even 1mm, she can lean out on ya. And that's hard on er.
I'd be glad to tell ya my formula, but I got a different motor, carb and all than u
Hopefully someone with an 85-86 can hook u up