Does anybody pay a pro to dial their system in?

One quick suggestion is to check the tweeters in the totem speakers it's not uncommon to have bookshelf speakers with one or two bad tweeters ... One more suggestion to anyone out there avoid buying bookshelf speakers if it all possible they are so overpriced and underwhelming ... Have been in audio for 60 years you are much better off buying a small tower speaker

One more suggestion if you find that the tweeters are in working order is try wiring the speakers in reverse phase and see if that makes them sound better it's not uncommon for companies to wire speakers backwards so to speak ... Never trust that companies build speakers or anything else with top-notch quality control ... Have seen a lot in 60 years of messing with audio

Yes, I have had the best set up guy I know come in for a few hours to help dial in the system. He is a very good friend and has set up some of the best systems that I have ever heard. He has been over a few times after major system/component changes. The results are always positive and the relatively modest cost has always proven to be money and time well spent.

The speaker placement advice is what I would try first.  I also wonder if there is too much dampening in the room.  See what the system sounds like when you remove the curtain behind the system, and replace with some diffuser panels behind the speakers.  I have the Benchmark DAC3 and love it - and have been considering adding their amp

Amazing system, looking forward to hearing about your experiments!

The curtains you describe aren’t helping. They are almost useless except for damping some of your highs. Certainly could be helping create the “muddy” sound you describe. You likely have a room full of chaotic sound waves.