Carter BBD tuning issues

If the choke is not fully open when warm, that's why its running rich. With the butterfly not fully open when warm, the air/fuel ration is off. Less air, but more gas. When the butter fly is fully open when warm, you'll have a air/fuel ratio. But until that butterfly is fully open when warm, you're just chasing your tail. Didn't mean to insult you with my explanation, it seems as though you don't have a lot of experience.