I was using a screwdriver to guide the rubber over the carbs on the airbox side. Thought I was being careful but I'll check it out.

I'm sure I didn't reattach the throttle cable exactly to the point where it came off, and it could still be a little loose. The wrench I was using tightened them just fine, but I'm iffy about the bottom adjuster nut. Doesn't seem like an exact science.

If I am turning the air screws, I need to tighten them down all the way, then turn them back out 2 1/2, correct?

The brass bushings are definitely still there or at least they were when I put the bowls back.