GOOD NEWS: There is a solution after all.
You only have to turn the resolution down the first time in order to make the connection. After that initial handshake is made, you can just project as expected while your SP3 is set to its normal maximum resolution.
I have my Samsung Series 7 UHD TV connected wirelessly as we speak. It's only at 1920x1080, but that's fine.
Strange, but good news. 1980 x 1080 is what I'd expect though.