Hi Nick. I think you really need to read and understand the links I left in my last post. DR as measured by the Crest Factor, and MAAT, and which is used in the Loudness Database is a different and not comparable methodology.
R128 is a broadcast standard and does not measure compression in the way you want it to. It is used by Roon for volume leveling.
Search the forums for R128, Crest, and DR. You will see any number of threads discussing the differences.