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Back in the good 'ol days, the HVAC guy would take a plan of the house, do some calcs and design a system to suit. The third guy sounds closest to that mentality but I'm not a huge fan of mini-splits.
I don't have enough information to make any useful conclusions but I'd be looking for guy with that mentality.
That duct work is a joke. Gotta be redone.
You can also measure how tight the house is and how well it's insulated, two things I'd do. If you plan to live there a long time, It's worth studying the whole problem.
Also, consider that some work may have to be done to be able to integrate new ducting paths in a sensible way, as opposed to "working around" limitations that come from "I don't want to make changes to walls, ceilings, etc."
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We need not be gracious when our enemy dies. Civility is only afforded those who don't go to their grave trying to destroy us and ours. E. M. Burlingame
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