No, Im not sure but in the process of elimination we changed plugs, coils, CDI, ECU, map, baro and 2 types of fuel during testing. It acts like the flame is being blown out but we just cant find anything wrong to cause that. The A/F curve does not show the bike going lean up top but due to the dyno's gas analyzer delay it may not show up under our circumstances.
The only thing that did help was to lean out the A/F to 13.5 or grater also leading toward fuel starvation problem.
I also have reason to think my fuel pump my be marginal but I forgot to take my spare with me.
Are you running one step colder plugs by chance?