M7 - poor 5ghz WiFi performance

[panoptician]

I just replaced a damaged Droid DNA (HTC Butterfly for the rest of the world) with a Verizon M7 and I noticed that the 5ghz performance is much worse than the older phone. It's fine if I'm close to the router, but the signal drops sharply as I move away. The DNA gets 35 Mb/s in my living room but the M7 gets 2-3 Mb/s if it doesn't drop the connection entirely. 2.4 performance is normal. Anyone else able to compare their 5ghz performance against another device? These phones are almost identical spec-wise, but they did revise the WiFi chip to support 802.11ac.