Funny, I never saw those speeds when I tested my 868L, I'm seeing 10mb on Reads on my Mac Book Pro on 2.4Ghz. Upwards of 20Mb on 5Ghz.
What Rev is your 655?
You still haven't answered or given feed back for the questions presented. It's hard for us to get a better idea with out a bit more information. Helps us to give better suggestions too.
If your travel is interfering with your person then i would presume that maybe some of your testing would not be as accurate if your tired. Also distances can play a role in speeds. Most testing is done with in 6-15 feet. Also other near by WiFi and the use of same channels will impact speed testing. I do all my testing with ALL devices and radios turned off. I use one PC or Laptop, the router and a wired PC server or NAS for READ and WRITE operations. Check for open channels, 1, 6 or 11 is preferred. If your in a WiFi congested area, then the lowering of the power output of the radios may need to be used.
Managing Signal Congestion and
Good Neighbour Policy Also testing with HT20/40Mhz Co-existence will impact results as well. I prefer to use this option OFF.
I'm going to presume that your results are not valid and your claims to this product are the same for now. Theres to many variables here that are giving false positives.