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I think I know what the problem is here as I got stumped on it to.
Everything sounds correct as you describe it but the problem is the butterfly itself. On any normal carb, the butterfly limits the amount of travel and acts like a stop to close at idle speed. On the two 300’s I have, it seems like the butterflies are too small and they spin right thru the carb bore making the linkage on top reversed. I don’t have any photos handy but I’ll try and get some later. The butterfly might have a slight bend in it and I might have adjusted the bend a bit and relocated it using the screw holding it in place. Can’t remember. Whatever I did, I got it to stop where it should and the throttle linkage works correctly now and the motor runs good!
https://www.youtube.com/watch?v=-wWAGHn … e=youtu.be
Thinking about it more, the spring may have had some bearing on the closed position to.