Not to be a jerk, but that sounds like a band-aid fix for a more serious problem. First, you shouldn't have to screw in the idle screw that far to begin with. Idle speed can be controled via the correct slide cut and pilot/idle jet combination. This is why there are many different cut aways on carb slides, every engine and rider have different settings. Second, it sounds like they didn't want to take the time to do a proper carb conversion (which is very time consuming and requires a lot of documentation) to help out the general public. Carbs are simple but they can become a nightmare, I suggest you study what part of the carb has a replacable jet, tube,needle,slide etc and see what and where it functions. Then see if there are alternate parts available (leaner/richer).
It may end up being that there isn't a slide available with the proper cut away (bigger) and you may need to machine the existing slide a bit. If you go this route, carefully measure the slide in stock form and gradually cut away material. measure this amount and document it. This will come in handy when the slide wears out and needs to be replaced.