I've been having some intermittent lag issues lately (rubberbanding, general lag, etc), and I can't recall things ever being like this before the most recent maintenance (9/16 12:00-2:00 AM PST). It could just be a coincidence though, since I see some activity on the other machines connected to the router.

As for the ping, since I began checking, it's always seemed to be, at best, roughly equal to the Japanese servers, but never obviously better as you'd expect.

I don't know much about servers and whatnot, but given that they just monkeyed with them last night, I wouldn't rule out that they did something to cause this (if indeed your issues just appeared today).