When I've tried to vary what time I start the meat, I always panic when it's not done by the time I think it should be done, based on past cooking experiences. Therefore, I find it easier to stick with my original starting time of 11:15 to 11:30 PM at a pit temp of 200* for butts and briskets, bringing it up through the night to a pit temp of 235* for the ribs to go on around 6 to 6:30 AM.
I know Jay and the boys cook a little hotter than I do, so they put their meat on latter. I've been at a comp where a team next to us didn't put his briskets on until 3 AM, but he cooked at about 250*-275*
So I guess the true answer is this: let your style of cooking be a guide as to when you need to start your meat......everyone's mileage may vary!