won't idle below 1000rpm after rod and jet change

70aarcuda said
a rich carb is not going to idle faster...just going to water your eyes and foul the plugs...

I understand but wouldn't it idle faster if the idle mixture screws were turned out more like in my situation to get the highest vacuum reading? It is just that I ran out of adjustment for the idle set screw, to bring the idle down to 750-800 rpm