Internet50 continuously limited between 2.5 to 1.2 Mbps

I have solved my speed issues with my Bridge.  As this may affect other users too, not ones limited to my specific Linksys WES610N, I'm posting this to complete this thread (to make up for my earlier Telus bashing...).

The fix was a setting-change on the Telus router (T3200M):

The key was the Channel Width parameter, it was defaulted to 20 MHz for 5G ... same frequency bandwidth as the 2.4G signal... I then looked up my WES610N's specs (shown below) and found that 5G ought to be 40MHz and changed the parameter accordingly.

For good measure, as I have no 5GHz 802.11ac devices, I dropped the compatibility for it off that second drop-down menu, and limited it to only A and N.  I changed both variables at once, maybe a no-no, but it worked so I won't go back and increase the compatibility options. 

Finally at last I get internet download speeds in the rated range to my work computer (~41 Mbps)...I would assume then that media devices also hardwired into my WiFi Bridge will have better throughput now!

My last resort would have been to turn-off SmartSteering and have separate SSID's for each 2.4GHz & 5GHz radio, but since I also have the range extenders, that would give 4 SSIDs total for the house, and the need to train (i.e. sign-into) all 4 on every device to be sure things went smoothly.  No-thanks not how I want to spend my 1 hour of daily free time after the kids are asleep before it's my turn!

Hope this helps somebody else...RTFM as they say!