How do I get the Mac Pro (2013) to recognize 4K monitors correctly?

I have a 2013 Mac Pro, Six core, 32GB ram, FirePro 700s, 1TB storage, OS X 10.10. It's connected to a Samsung UN50HU6950FXZA 50" UHD TV via HDMI. The system info recognizes this monitor as a 120.5-inch with 7680 by 4050 resolution. WOW. In the Displays Preferences, this resolution shows up as "best for display". The actual resolution of the monitor is 3840 by 2160, but the closest scaled resolution shown is 3840 by 2025. This actually almost works ok, but requires setting the monitor to "fit" instead of 16 x 9; otherwise the image is slightly too wide for the screen. This happens whether the monitor is connected to the computers USB port or to a Thunderbolt port with a Mini DisplayPort-to-HDMI adapter. I've tried every combination. I've also booted from a different system disk, reset PRAM and power manager multiple times, used various combinations of monitors, disconnected all peripherals, run hardware diagnostics, everything.
I tried to use the computer with a Seiki 39-inch UHD monitor and it also showed up with these weird resolutions sometimes on startup, maybe once in five times. I thought it was a monitor problem, so tried the Samsung.
There's more, too. The machine doesn't play well with multiple monitors if one of the monitors is a 4K., it is not happy when I uses Spaces with a 4K monitor. In some cases, Final Cut Pro or Premiere CC will get jerky playback, the mouse pointer develops trails, other symptoms that look like graphics card failure. Only a restart corrects these issues.  When the computer wakes from sleep and a 4K monitor is used, the application windows do not come back to the same place on the screen; with 2 monitors, the windows may come back on the wrong screen or the menu may be on the wrong screen, or both.
I wonder if anyone else is having similar problems. I have been on chat and phone with Apple support multiple times over this issue doing screen sharing and various diagnostics.  While they keep trying and escalating, no real progress has been made. I bought the Mac Pro to be able to work with 4K video and actually display it. So far it works, but there are lots of compromises and work-arounds. Apple has suggested bringing the machine to the Apple Store, but since it works fine with smaller monitors, that probably won't help. I finally got a support person to say they may need to try on-site service. I have a call scheduled for Monday--so maybe something will happen.
The Pro is a great machine, but this stuff has been driving me crazy for months now. It's a great machine that just isn't ready for 4K yet

The available display proprieties are based on information that the monitor/TV sends to the Mac. It appears it is not sending the correct info.
You said " This happens whether the monitor is connected to the computers USB port or to a Thunderbolt port with a Mini DisplayPort-to-HDMI adapter.".
I am confused about the reference to USB.
Does the TV have a displayport or mini displayport input, that is best to use.
Try using the free Display Menu app from the Mac app store. I have to use that to get 3840x2160 (native resolution) on my Dell monitor)

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