Before you change much more make sure the all of the air bleeds are clean. Inside of the choke horn there are two brass jet type plugs (8 in all), spray some carb cleaner through them all with the idle mixture screws removed and see if that helps. I start at 2 turns from bottom on the mixture screws and most times on gas it is a good starting point. Make sure the transfer slots are not covered up by the throttle blades as well this will make a bog between idle and part throttle.
I am also not against drilling the front throttle blades to help clean up the idle a bit.