Having a weird issue with my Decos, my download speed is significantly faster than upload despite my internet being synchronous. The issue persists whether running in AP or router mode. Setting and unsetting QoS doesn't help, testing devices directly wired into the router doesn't show any speed issues. 

Trying a different port on the wired router didn't help either, this has persisted through at least one firmware upgrade. It seems that upload speeds drop off a lot more with distance than download speed, this doesn't seem to be specific to either unit. This disparity is reproducible on multiple devices, I am wondering if there is some sort of logic built into the system that boosts download speeds and/or if there is a setting I can configure. 

Here is an example speed test via Deco
 

EDIT: Seems like beamforming might be the culprit, with it turned off overall speed is slower but disparity betwen up and down has shrunk, however it is not as consistent as it was with beamforming on, here are example speed test runs (machine in the same place, no changes between runs):

RUN 1:

RUN 2: 

RUN 3: