Originally Posted by grizz1

Just keep tweaking the idle gap in a little at a time until it comes in and sits with a steady idle Matt. Then if needed richen the bottom end a little to compensate. You may have to juggle these two to get the idle speed you want. The revs dropping is 90% going to be the idle gap is just a smidge too wide.
I have found when the motor is right on song with a good steady idle, the idle gap is tiny - nowhere near 1mm and probably less than .7mm going on the trusty eyecrometer (with glasses fitted)