Poor signal quality, slow speed, packet loss - OKC

Preferred Tier Internet, Cisco DPC3010 modem, located in SE Oklahoma City

For the past 2 days my speeds have been unusually slow, with frequent, intermittent drops.  My modem does not restart, all lights stay lit, and it appears to not totally lose connection.  However, webpages are often slow or sometimes time out, video streaming is impossible due to buffering, and online gaming results in much higher than normal latency and disconnects.  This all started early yesterday, which happened to be one of the first very windy days so far this year (25-30mph, 45-50 gusts).

I've used pingplotter, speedtest, checked signal levels, etc.  Pingplotter running for an hour shows the intermittent drops, with 10-20% packet loss.  Speedtest is all over the place, sometimes 45-50mbps down / 8-10mbps up one minute, then 3-5 down / 0.5 up when I test again right after.  And something is definitely up with signal levels :

Setup is, as installed by Cox 2 years ago:
                        OUT --- 3-way splitter to tvs
Drop --- IN  <
                        TAP --- Modem

I tested swapping the TAP outputs so that the modem gets the OUT, and the 3-way gets the TAP.  Downstream power levels came up, but still within range.  Downstream SNR stayed about the same, decent on the first 4 channels, below spec on the last 4, with channel 6 occasionally dropping to 0.  Upstream channels did come down a bit and locked on all 4 instead of just 1.

Also tried bypassing the TAP and 3-way completely, just having the modem connected directly to the drop.  Power levels up a bit more, and SNR very slightly up, but still < 35 on the last 4 channels.  

With all of these setups, I would get the same intermittent connectivity loss, dropped packets, slow speeds, etc.

2 years ago, I was dealing with what now appears to be the same thing.  Early spring, the first really windy day and here come the connection problems.  I had 5 different technicians out over about a month's time, when my connection would come and go.  They replaced my drop and connections, tried different combinations of splitters, replaced cable with R6, convinced me to buy a new modem, but nothing helped.  At one point one of them said there was some noise in the line, but they couldn't figure it out, and that it would be escalated.  It was ok for a few days, then back again.  More calls and more appointments later, I find out that the ticket hadn't been escalated and was marked as closed.  On to the last tech, who checked everything all over again, said he honestly didn't know where the problem was coming from, and assured me that he would have everything passed on to a maintenance technician.  A couple of days later, I get a call from a line tech who says that they found a crack in one of the main trunk lines in the area, fixed it, and that it should fix my problems.  And it did, for the last 2 years.

Anyways, I do have service call scheduled for 2 days from now, but would really, truly hope to not have to go through the line of techs again, and was hoping someone might be able to look at this and get it passed on to the appropriate people, or else let me know how I can do so.  Will gladly provide any further info that I can.  Thank you.