Please check out the “Halfmile” iphone app. Just like the Halfmile maps mentioned, there is a ton of info for the entire trip; it is almost made too embarrassingly easy. The app tells you of all water crossings, camping, etc, in a linear manner, along the entire PCT, which is pretty much what you will be doing. It also tells you resupply opportunities, which will be your major challenge on a September trip. The section between Tuolumne and Tahoe corresponds to PCT sections I & J. I *think* (have not checked) those sections need to be done in two 75-mile chunks, doing resupply in Sonora Pass. The PO in Tuolumne closes early in September, and I have not read any current information but I would be surprised if they have opened MTR, and with all the snow and a late and small season it seems hardly worth the effort. September is a fabulous month to do this trip, but resupply definitely requires an extra effort, all the more so this year. No one on this site can tell you dates, because all of the resupply places tend to have a laissez-faire attitude about their schedules. Resupply should probably be where you should do your first research, and trail direction may very well be dictated by it.
I also question that you can do more mileage north of Tuolumne. In Section I, I found some of the trail to be a bit more rough and uneven than in the south, with more nasty 10-14″ drops that are hard on the knees. It gets much less traffic than south.