Wideband AFR tuning help.

i am having a hell of a time figuring it out. i can adjust my carb to read anything i want as of afr's(by drilling air bleeds idle circuit and high speed) but still cant get my stroker to pass smog. hydrocarbons read a little differant on a smog machine.

plugs do look a little white if you run over 16. i pretty sure its suppose to be 13.5 to 12.5 under load.

id like to help but thats all i got.