H2 running rich partial throttle past 4k

[Kaiylar]

Got a h2 track bike as a project and I’m using a aem wideband gauge, it has half the airbox removed just leaving the rubber stacks and the mesh filter holder to keep objects out, standard headers and I think it’s a standard pipe. It has 102 mains and 35 pilots, at idle it sits at 13 afr but at partial throttle as it revs to 4K it will slowly drop to 9 and sit there, at wide open throttle it goes to 13 again it’s just at partial throttle off idle that’s being problematic and making it quite jerky and sputtery under 4k, past 4k it wakes up and revs out fine

Any ideas?