I'm sure others will comment otherwise. But in my experience, your DS SNR is dangerously low, and may make your line 'flappy'. I suppose it's a 'suck it and see' scenario, as its a balancing act between speed and stability and you appear to be on a long line.
As an aside, is that your true DS attenuation (65dB), or is that just the routers maximum reportable figure ?? In other words, are you actually on a higher-attenuated line than what the router is reporting ?? If it's the true figure, then I would suggest you have a lot of aluminium cable in your MPF's 'make-up' ??.
I don't know if you've tried this tack before, but there may be a 'better cable to Cab', that your circuit could be transferred onto ?? A very high percentage of Cabinets have 2 or more cables feeding them from the Exchange. These are made up of a hybrid of differing lengths of Copper and Ali cable, or, the whole length could be purely Copper or Ali ?? Ali cable has a higher resistance, and as such higher attenuation. Circumstances dependant, but EU's can achieve massive gains from a simple 'E-side change'. We have one Cab locally that has a 22dB difference between best and worst cables.
PS ...... on a personal note, and even though its intended on a positive note, I wouldn't want my full name to be mentioned on a public forum. Especially with todays OR 3rdReich mentality. Not intended to offend you liknoj, just an observation mate.