OK. I think I follow you.
I'll explain why I asked and maybe you've already got this but if not then we've put it to rest.
Making it richer the idle and vacuum fall off more slowly than when turning it leaner.
Turning it in (leaner) the drop from right on the money to dying is pretty quick. So normally that's considered the best approach to adjusting the mixtures; turn in until rpm or vac just starts to drop and then turn it back an 1/8 to a 1/4 turn. Its better to go back a little more because when the engine is put in gear it needs to be a bit richer to have power to turn the transmission.
I hope that made sense.
Unfortunately I haven't worked with that carb so don't know if 2 to 2.5 is typical. I expect someone here will know
