Well, Deborah, you are further ahead than most of the info I have received. I got the copy of one paybook directly, on my first request for information and about two years later I got 3 actual paybooks that had been found.
I try a 'shotgun' approach on any request for info which sometimes works. I write to absolutely EVERY address that I have found concerning an individual. I got the actual paybooks by writing to an old address that was included in my father's military records. The home had been sold many many years earlier and they told me that they knew nothing. Eventually the 'new' owner of the house died and his son found my letter while they were cleaning out the house and also found a small box with most of my father's military documents... in the attic that no one ever went into.
Of about 30 tries at what I call 'cold letters' to unknown people at 'found' addresses I have gotten good information back on 3. So my score is about 10 percent... but for 37 cents a try, it has been a good deal.
As for speeding up NARA or the VA. If you find the secret to that you could probably market it.
It looks like you have done quite a bit of work considering the time frame you are working in. I believe that was the Battle of the Bulge period in Belguim and at the speed that things were happening at that time, it is amazing that you have any info at all.
Maybe one of the guys who have the big set of the "Order of Battle" books can tell you more about the 79th Repo Depot