You know, the din chart is a great initial guideline, but your din setting is something you will constantly rediscover about yourself as you progress and ski more. I'm 5'10 140 lbs, and I ride an 8 on my park skis, a 9 on my hellbents, but I know a guy who's about 5'6" 150lbs and rocks a 13 on his obsetheds, just because he charges harder and goes bigger than I do. Here are the things you need to factor in:
How tall are you? As your height increases, your leverage on your bindings will increase proportionally.
How much do you weigh? The retention needs to be higher to support a higher weight.
How aggressive are you? You said you were an aggressive skier, but how fast do you ski generally? Are these park skis or powder skis? Do you hit cliffs/drops? Will you be skiing powder or groomers? These all factor in to the equation as well.
What is the BSL on your boots? The shorter the bsl, the less leverage your bindings will have on your boots, requiring a higher din.
How long are your skis?
How old are you?
I know you've answered some of these questions already, but if I were you, I'd check the din chart, find your reccommended setting, and use that as a starting point. From there, if you're prereleasing a lot, bump them up a notch, or if it's a very rare prerelease, half a notch. It's easy enough to do with an oversized screwdriver. On the flipside, if you fall badly and your skis don't come off, ease them off a notch. You'll soon find that "sweet spot" and you'll know what to do from there. Hope this helps.
Also, be realistic with the way you ski. Don't set them at an 11 because you think you might drop a couple 35 footers this year if you rarely venture off the pistes. It's sadly common these days to see people rocking a din way too high for their needs, so be honest with yourself. It's a lot cooler to have a moderate din and ski the whole season instead of crankin' em up to make your dick feel longer. You won't be thanking yourself if you explode your ACL when your bindings don't release and you're out for the rest of the season. Cheers.