The metering rod is pretty sensitive as far as adjustments go, for best results eye ball it best you can and go for a drive with a slight incline and an acceleration ramp. If it really runs good, lower the metering rod .050" and try again. It may take a few tries but you are looking for a lean condition, uneven running, slight engine temp increase, lack of power. When you find this spot, raise the rod back up .030" or so till it just goes away. I use a set of calipers to measure the rod location. Since I have a air-fuel ratio gauge mounted in my truck, .040" difference on dual W-1s will change the air fuel ratio as much as 1.5 points.
Joe
