I have a similar set up.
39mm carbs. CEL dropped all the way down.
175 main and 48 pilot.
Shearer small bores.
I had BB Sheares on it and hated them. Sold them got small bores.
I tried mine both ways. I quickly went back to the PV's. I absolutely hated it without them. But, im not a drag racer.
There great for on and off the throttle riding.
I got a 06 Dodge 4x4 last year and absolutely love it. The only problem with the Dodges are the auto trans have a bad reputation. I've had no trouble with mine.