THe air fuel mixture screws are for idle and just off idle. Around three turns out is about normal depending on the elevation you live at. You may want to make sure that you don't have a dirty jet. You may also want to adjust the c-clip on the needle.
life is short. so enjoy
2007 Honda Shadow Spirit 750DC
1970 Yamaha CT1 175
1970 Yamaha CT1 175 supermotard