If you're between 3/4's of a turn out and 1-1/2 turn out the car should run decently. You can also try the old trick of adjusting the turns so that when you pull the rubber plug off the intake manifold port the RPM's stay the same. The most important part is
not to have your idle turned up so far that you're too deep in to the transition slot. Or, you can do what I do to get it just perfect.........
Make sure your primary butterflies are at the bottom of the transition slot, back your idle screws out about 3/4's of a turn from seated, then adjust the idle speed by cracking the secondaries with the hidden set screw. Then take your car out for a steady slow drive with the throttle lightly applied and steady and feel for your
lean surge, which you should have. Back the screws out 1/8th of a turn and repeat until the surge is gone. The object is to have the leanest possible idle mixture setting that allows the car to run nicely.