Help need suggestions & advice

It's hard to believe it's the carbs fault, since it's happening so fast. I assume the shaft wear is on the firewall side of the pivot. Since the Lokar mounts to the lower side, I have to believe you have a bad cable (extremely tight) or it's adjusted to tight and doesn't have the full range of movement.

I'd unhook the Lokar, then open the throttle all the way, and manually pull out the cable and make sure it will come all the way out to the current mounting point.