so I have a fully built KOR built blaster fully drag ported, shaved head, 240 Vito's big bore bored to 73.00mm, +3 Vito's stoker crank, v-force 4 reeds, lightened fly wheel, advanced timing by 4, RDZ big bore drag pipe. I'm having a issue getting it tuned thinking i need a bigger carb I have a 34mm mikuni flat slide running with a 320 just needle all the way down running a little rich but when I go to a 310 jet needle all the way up its leaning out please help thanks