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Brian, first of all welcome to our forum – sounds like with 3 sub-primals already aging plus buying a new dedicated refrig then you jumped in with both feet!
I’m not sure I can answer all of your questions but perhaps if we address several points we can figure this out together. First of all you said this was a new full size refrig so I’d think it would be working properly – however your humidity levels sounds like drying aspect of the refrig is not working. Are you using some monitoring devices that you know are trustworthy and accurate? If so I’d get a service call lined up soon.
A couple solutions that might work would be to set the temperature colder so the compressor cycles more frequently and also merely opening and closing the refrig at least a couple times a day would allow an exchange of the air. You might even want to move the meat around as well as flip it over..
Seems strange that the fat side would seem hardened, but the ends remain soft – are they really that soft or are you pressing really hard?
The smell you mentioned sounds proper so you probably are OK, but the moisture loss won’t be as high as normal. BTW have you actually re-weighed the pieces to check what the lost has been so far?
And lastly yes posting some pictures might help.
Ron