keep your carb settings to what you always ran on your DD engine,nothing wrong with those settings
im almost certain you just have the carb tickover screw incorect,just raise the tickover and im sure it will be ok.actually,im surprised the engine isnt cutting out when you lock up the wheels under breaking which is a common thing when the tickover isnt set properly
dont bother trying to set it out the stand as its completely different when the engine is under load,you will know when you have set the tickover too high because the kart will feel like its pushing on in the corners.
let us know if that solves your problem.going leaner or richer on the jets does indeed alter the tickover but its the little idle screw you need to look at
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