More likely the small holes just downstream of the butterfly are plugged. poke them out with a small diameter wire. Pull one out of a wire brush, thin and strong.
Also factory pro kits are pretty good!
AFR gauges are pretty dam indispensable but what really makes them awesome is data logging. Take a few hours running around and put it all on a scatter plot. Or take the machine to a dyno and look at the results when you're home or even better take half a dozen 1/4 mile runs at red line make some changes and go again. On board data logging is like having a dyno under your seat.
Awesome to see you're back! Didn't we do a deal for a yami reg years ago? I always thought your gs550 was one of the most perfect Turbo bikes ever! I really should copy it some day.