Posting some more graphs from my device -
http://imgur.com/a/KuMmtWhat mostly peaks my curiousity is the major fluctuation on the SNR for both US and DS between 16:30~ to 21:00~. I haven't noticed this before. I imagine this could either be something interfering with the connection and relates to the CRC errors I have, or possibly a fault beginning to show itself, or perhaps it's just the ASUS's modem? Obviously without a Hlog and QLN there's no real easy for anyone here to analyse this I'd assume.
I'm really hoping the MK3 SSFP will arrive tomorrow at the very least, as soon as it does I'll probably run the ASUS for another 24-48 hours to observe if it has helped or not. After that, if it hasn't helped or a problem may still exist, then I'll switch to the HG612, start logging and then make a thread in the FTTC issues section. I hope it's not another possibility of a battery contact again.
EDIT: Updated album. Seems I had a disconnection shortly after that (a major CRC spike again). Since reconnection my power has changed, SNRM is a tad lower on downstream (though I believe stabilised), and less errors occurring at the moment. Also around 11:45am I did a reconnection myself (switching from MK1 to MK2 SSFP as I was comparing).