Ive got the 400pm slot at Tropical Bay in April '09. Im considering changing it if possible... not enough time between the ceremony and the reception for pics, drinks.. etc. We'll see though...
Plus, every other wedding I've been to there was a huge gap between the ceremony and the reception. I always managed to keep myself entertained (drinking). Go with the flow, your guests might like the delay - they can drink, relax, have a nap, get refreshed... Remember everything is on island time anyway, mon.