IMHO if you are getting a lean code.... running WOT is just plain stupid and monitoring it with Torque. I would track down why number 4 and 6 are misfiring. As you are getting misfires on cylinder 2,4, and 6 which are all on the same bank... makes me think fuel rail. I would suggest pulling your fuel rail off, check all the o-rings, and try reseating it. The fuel rail might have got slightly bent that is un-noticeable, but very likely. As the misfires seems to increase from left to right, my guess is the rear right of the rail is still way off.
