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Lets see..... 125kbps down 101kbps up. https://testmy.net/db/imGCMIxlD.87dTs5p2y

This is Wi-Fi over 802.11ac (MIMO 1300) -- capped out my 100Mbps internet connection. Windows reports it is allegedly running at 520Mbps, I'll have to prove that one of these days.

If you're 2.5 miles from the "home office" (typically an MDF/IDF - main / intermediary data facility), you are outside the "sweet-zone" of ADSL. Typically, (A)DSL sees maximum throughput at 2 miles or less from a MDF/IDF. Basically, the distance between your demarcation point (modem) and your ISP's closet. You're only half-a-mile outside the sweet-zone, so I would still expect you to see reasonable speeds. That said, you might never see a stable 6Mbps, due to ADSL typically using older, buried phone / Cat3 lines. (Unless CenturyLink ran shielded coax/twinax copper or fiber, which I highly, highly doubt.) The burst you see with TMN is likely because the lines are cool, so there's no electromagnetic field around them. Because ADSL is typically Cat3, it's often minimally (if at all) twisted, unshielded, and poor-cabling, so it's easy for the cabling to build an electromagnetic field that interferes with signal transmission. This field won't exist at an idle, it will only exist when data is being transmitted. Once the field has built up (often as quick as 50-2500ns) it starts creating cross-talk and signaling interference, slowing the throughput you can achieve. (Basically, error-rates go up, and as a result more of your bandwidth is spent on handling those errors.) Unfortunately, without replacing the cabling, your speeds probably can't be improved much. All that said, does CenturyLink offer 5Mbps? If so, I would downgrade to that and run some more testing. If their signaling is wonky, you'll see a similar drop (I would expect either 1Mbps or 833kbps drop when you switch if they have a signaling calculation incorrect). If you don't see a drop, save yourself the money and keep the 5Mbps connection. If you see a drop, document it (now, the 5 vs. 6, and then, the x vs. 5). If you still have a drop, call CenturyLink and explain the situation. I have no idea how well they'll assist you, but they should be able to make other accommodations (provide 6Mbps but bill at 5Mbps, for example).

Interesting. So, if their own "blessed test" is a meg off, I think you already have a case to present. I don't know whether you already have <?> Are you mandated by CenturyLink to use that specific router? I am really not happy to suggest spending money, who the heck wants to do that. But, an ISP only believes one configuration is legitimate when discussing your issues - and that is for your systems to be attached directly to a modem. In your case, you cannot do that since it is all built into one integrated entity. If you were inclined to separate the modem from the switching and Wifi gear, someday, it might be in your interest to do so. The ISP techs, the kind that come to your house, have a gadget they use to hook to the modem. I would be interested (if it were me) to see what reading that thing produced. Those gadgets produce all sorts of results, including REAL jitter (not network jitter) based on the clocks in the data stream. They also produce results regarding signal level (usually in db) and they produce results in Mbps !! The thing we want. If you don't have a discrete modem, then having a tech run the gadget is a good idea. In your original post you asked whether your modem could be slowing you down. Maybe. But I think more than likely, if the culprit lies anywhere in the a90-7500, my bet would go on the switch/router settings. I say that because if the modem part of the box were getting transmission errors, they would see it at their end too, and your log would be filling up. So, service call for tech+gadget, and check all the logfiles. That's my $0.02

Note that the test result included this caveat: 633% faster than my average US 818 kbps (!!!!) I live in northern New Mexico, 20 miles north of Santa Fe, and CenturyLink charges me $45 a month for 7 Mbps, which I never get.