shawn I think your float level is too low I would recheck that before going any farther I think the low float level is leaning out the transition circuit and your are trying to overcome that lean condition with the idle air control screws there are seven circuits in a carb the two circuits that will change the fuel mixture in all the other circuits are the choke and float circuits if you have driveability problems from the carb. it's always an a/f mixture problem that's why I think it's the float level effecting both the idle and transition circuits sometimes simple things can have you chasing your tail that's just my 2¢ worth .....ted