For what it's worth, I tried upgrading again to 17.1.0.19 using the Intel Driver Update Utility 2.0. After the restart, my speed tests on 5Ghz were getting between 2-3Mbps. Removing the driver through device manager and rescanning to get back to 16.0.0.62 got me back to over 100Mbps without even having to reboot or remove any PROset software from Add/Remove Programs. There's definitely something up with the current drivers.
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