Typo's Asside The Progression Is Consistent
If you think back over the last 3 months, they went from April, to June and now to August RD's. What the NSC seems to be doing is a bit of house cleaning on old cases. They presently seem to be working July, Aug and Sept. My guess on July is that they will be done in about 2 weeks. If you look at Rupnet you will see a huge spike in RD's for July and August as that is when all of the priority dates became current last year. Once they have cleared out this backlog I would expect them to get through the RD months quicker.
I do not think that DHS will impact this in the short to medium term. Tom Ridge is not going to be processing cases or personally re-writing the rules.