Can't answer you specifically. We went early August 2005. But here is some info.
As everyone knows. the summers are milder in CA than FL. So summer is a busy time at DLR, and people do not get drained as quickly at DLR than they do at WDW, and hence can hang at the parks longer creating additional crowding.
Also, DLR has Annual Passes with blackout dates. See link here:
http://www.mouseplanet.com/misc.php?pg=blackout
Notice the left and middle column. You see how these are blacked out July and August, and then lift in late August? What this means is that people in Southern Cal with these Annual Passes will be blacked out for two months and when the blackout lifts in August they will come back to DLR before the summer ends and schools start. One of the reasons DLR does this is because they know the crowds will start to go down, so the impact of the AP folks will be less. In addition, that is when DLR starts to shorten park hours. So what you will likely see are lower crowds than the preceding weeks, but reduced park hours. So you may not be able to get a lot more done than you could earlier.
In general, no matter when you go to DLR (and WDW as well), you can get a lot done if you set your schedule to take advantage of other people's tendencies. People come to the parks a few hours after opening and then leave early. See my link here summarizing this conventional wisdom that applies at both DLR and WDW during busier times.
http://www.disboards.com/showpost.php?p=12294563&postcount=7
In late August you will need FastPasses, and lines will be longer than 20 minutes. Not trying to discourage you from going. I think DLR in the summer is a great experience. But if you are a late riser and early departure person, you will only experience a fraction of what you could with a better plan as summarized in the link.