Correct Raj, I got curious and just to see what would happen backed the high neede out on my 100 4 turns rich. Guess what? No change in the running characteristics of the engine. If you do back off the needle it basically is running as rich as the regulator will allow it too, esentially the needle can only be used to lean the high end beyond that "max rich" setting.

It's sorta weird when you first get one of these, it's something you have to kind or "wrap your brain around". I thought something was wrong at first but once I stopped trying to overthink the situation it made sense.