I had some fun adjusting the idle....took me about 2 weeks to get it right

hahahaha
The top screw you are talking about is the 'warm' idle when the car reaches working temperature and it should sit at around 800-950rpm
The cold idle is under the throttle cable. You need to turn the car off and then pull the throttle cable up. That will expose another flat head screw and thats your cold adjuster. Turn it right and the idle will go up...left turn is lower the rpm. Start the car and see the idle...should hit about 1000rpm or so when its cold and as soon as you turn the lights on it should rise to around 1200rpm. You need to 'depress' the accelerator pedal (rise the revs) so the accelerator cable isn't 'stuck' (if that makes sense)
You will definatelly need to do this a few times to get it right but remember that you need to adjust your rpm with your lights on....(hot or cold the lights need to be on)
Idle should be around 900-1000rpm with lights on when the car is warmed up and around 800rpm with the lights off.
Someone please correct me if im wrong though
