First, there are three places where the default time zone is set (lines 95, 505, 614 in my development version). Did you set all three to NY?
If so, do you mean that games you have previously scheduled with the timezone set to the default (Los Angeles) moved forward three hours? If so, that's exactly what should happen. The dates and times are stored in system time (seconds since 1970) and converted to the default timezone for display. So 5pm in LA and 8pm in NY are the same to the system (and to the plugin).
OR, do you mean you are entering NEW games and the times are messed up? I'm not seeing that on my development site.