I don't think it makes much of a difference -- the GPA/LSAT of people accepted on LSN stayed pretty constant throughout the cycle right up until UCLA started taking waitlist people, when the numbers dipped a little bit. This cycle might be anomalous, though, since UCLA got way more applications this year than they typically deal with (8,000-something, rather than 6,000), so even early applicants ended up having to wait a long time to hear back.
Good luck with your applications!