help with plug chops

omg really?
to do a plug chop you do that following
1) warm quad up with old plug
2) once warm you put new plug in
3) take quad down rode and shift through the gear, once in 6th, you hold the throttle at what ever position you are checking for jetting
5) hold throttle at position for about 15 seconds
6) after 15 seconds turn quad off and coast to a stop
7) put old plug back into quad and ride home
 
i have done everything. i removed the tors, changed my jets from 260 to 320, rebuilt my carb, bought new reeds, changed all my gaskets, played with my mix from 32:1 to 50:1, cleaned and bought a new air filter... and after third it bogs at wot. i cant figure it out. if i give it gas slowly, i can get up in speed, but once i do get there it just bogs. cant figure it out