O.K. folks, here are the final results.
I took my needle out and chucked it up in a drill. I used some 240 wet or dry (the black stuff). I pinched the end of the needle lightly and ran the drill while keeping the paper moving and changing the paper position every several seconds. The brass needle started leaving some grey residue so I kept at it for about ten minutes. I then "dressed" the needle the same way with some 320 wet or dry and reinstalled the needle clip where it had been- third slot from the top.
I ran the bike and now it was so rich I flooded it with full choke. Once I got it started and tried to clear it out, it still ran in a rich four cycle. I pulled over and changed the clip to the second from the top, fired it up and the dang thing ran better than ever. I don't need partial choke for 1/2 throttle cruise as I did before, and it runs clean and even at WOT.
I've been running this bike for close to 400 miles with a uneven misfire at part throttle and in fact the only time it ran really smooth and clean was with a pretty good load on it. As soon as I reached cruise, it would go back to the misfire. Now it runs smooooth at part throttle, accelerates well at full throttle.
Disclaimer here- I got lucky, and the taper was good the first time out. If you are going to try this, do it when you have some time, and do it a little at a time. If you take too much material off the needle, you can't get it back and I don't know if raising the clip to the first slot is going to help if you do.
Take your time, test run it, take a little more off, test until it's good.
IF YOU HAVE ANY DOUBT ABOUT WHAT YOU ARE DOING, DON'T ATTEMPT THIS!