The odd thing is color on the plugs driving there, but clean at WOT even with more jet
Is this anything funny like an aerosol carb, or do you have jet extensions that could be holding the float back and not opening the needle/seat all the way?
ET is what it is, but odd if plug color and/or trap speed isn't changing with jets
When able, post the carb design, LIST # if appropriate, booster design, front/rear PVs and max jet sizes you have tried