A wheel out of dish usually wont affect pull. while i understand everythung looks aligned, the problem with a pull is usually with the frame or fork. if the fork is straight as you say it is, then i would check for headtube twist, when compared to the bottom bracket. the only thing that really used to check that was the park frame alignment stand that they no longer make.. a frame can appear aligned and you could still have a twisted headtube causing an issue.