Well, obviously I'm not quite there yet, but looking forward to when I soon am, and yes 4 or 5 pm server time would definitely be better for me. I'm an East Coaster as well.
Regardless of what we do at this time, we clearly have quite a few East Coasters now, so ought to plan on this at some time not too far down the road. But good way is to keep polling on raid times and regularly adjusting/adding raids accordingly.
Meltaway