DON"T USE DRILLED JETS!!!!!!!!!!
They might not get them exactly the same, and that is bad. Check for an air leak around the carb boots and reed cage. Check your reeds. make sure they are laying FLAT. If not, take the warped one off and flip it over. If you have problems in every throttle position,that would mean not only are the mains off, but so are the rest of the circuts. I would start by looking for an air leak. If you have a buddy with a Banshee that has similar mods, swap his carbs in and see if it runs better. If it does, copy his set-up and fine tune from there. If you are completely confused by the Banshee gnomes, take it to a reputable builder and pay him to get it spot-on.