I'am not sure I've never jetted the bike ..
I've never had this probelm until last night though ..
Though , I'am going to try this because I bought the pipes used and I dont know when the last time was that they where repacked ..
Your describing your packing burning up. After a lot of oil build up on the packing, a long high rpm rip down a long straightaway will cause the packing to catch on fire inside of your silencers. It will sit there and smolder until lack of oxygen causes it to burn itself out. Pull your silencers and repack them.
Ed