Putting a set of pipes and a high flow filter setup on a friends bike, 03 FXDL bone stock now, years ago I remember doing the carb on my 02 Nighttrain, I remember doing just a simple washer under the needle, this ring any bells? Cant remember what the specifics were, #10 washer maybe?

 

I used 1/8 inch pop rivet washers as they are aluminum and about 0.040 thick.. You might want to try a 46 or 48 pilot jet.. Remove the adjustment plug for the idle adjustment and adjust to best idle first..