What about adding some disks to your WB sounds like its rich I had the same problem so took my lid right off cut it and added a outerwares cover like in the Reviews section that works great I race XC no mud or water yet in the airbox I guess when I pulled the snorkle and was using just the holes I had it was not able to get as much air
after all that yea going down on main size would probably help
2001 440 yellow/Stage 2 hotcam/ 11:1 JE piston/Houser+2 a-arms/Dura blue eliminator+4/Maxxis or holeshot MX on 195 douglas race rims/aluminum airbox/ac propegs/ac bumper/braided brake lines/works triple rate with acr/pep steering damper/white bros e-series slip on/omf scoops/kn filter/dyna jet 170 main 45 pilot/needle on notch 4/outer wares airbox cover/custom aluminum airbox/renthal bars/acerbis guards/lsr block off/lsr bearing carrier NOW ALL THAT IS STOLEN!!!!!!!!so I am Starting Over with 2005 YFZ 450