Is that "UIS_GRP_ALL.dat" you provided the original file as-is?
No I dumped just the compressed archived file. I've attached the file one level up that has the necessary header info. Basically Madden dats are archived like this:
UIS_GRP_ALL.dat, which I didn't include, contains 30 archived files. Each one of those 30 files contains more archived files most of which are compressed.
The file I just attached to this post is the 4th file in the archive. The file I posted earlier that has no header info is the 35th file of that archive.
So, the header info for the file I posted earlier is found in the file I just attached at 0x128 for file offset and file size and 0x2B8 for decompression size.
Sorry for the confusion.
I know that EA Sports often uses/used custom compression for their game archives. But because of their connection with the NFL and the copyright/trademark issues they seemed to lock these files down tighter than in their other game franchises.