Just FYI - I'm only seeing the slowdowns in the evening.
As only the first-hop device appears to be different in the tracert, I doubt it's something upstream - if they were throttling, they'd probably do it at the network core - before it left the Verizon network for transit, which would apply to both circuits.
Meanwhile I can download games from Steam at 3+ MB/s, torrent at the same rate, and so on.
Maybe Netflix suddenly got a ton of demand shortly after the net neutrality ruling or changed their software, but frankly Verizon doesn't get the benefit of the doubt. They've done so many sketchy things that at this point if they aren't doing this on purpose they need to prove it.