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When you say you're an aggressive rider, are you talking off-trail, rough trail, groomed trail, or??
Not sure exactly where you are looking to ride, but I'll assume that you haven't had much seat time if any on it yet? Going on that assumption, I wouldn't get too crazy with changing anything until you have ridden it in the conditions you like the most.
There are a couple little things that I've done to every Nytro I've had, just to get a neutral starting position for the sled.
1. With the sled on a flat concrete surface, look at the portion of the carbide on the ski that is touching the ground. You should make sure that only the rear portion of the carbide is making contact with the concrete. The first thing many people here do is to take the ski rubber that's between the spindle and the ski, and turn it around backwards. This helps to push the rear of the ski down (front upwards) and makes a big difference in controlling darting.
2. Using a tape measure, set your handlebars as straight as you can, and measure the centerline of the skis, accross the front, and across the back. You should be looking to have about 3/8-1/2" toe OUT in the front. This usually has been off when I've bought new sleds, and taking the outer tie rod ends loose and turning them 1/2-1 turn in has set the toe to the range I mentioned.
3. Make sure all of your shocks start out in the center of the adjustment range. Can't remember off the top of my head how many "clicks" there are, but turn them all the way out, all the way in, and then find center.
4. OFT steering re-locater. Makes the sled much easier to steer, and for riders that stand up a lot, it helps with the angle the handlebars rotate as well.
5. Some people change the limiter strap on the skid right away, but if you haven't ridden it yet, I'd say to wait until you can ride it, but this can make a big difference on the ammount of push and steering effort you will experience. They are somewhat of a heavy steering sled to begin with, so for my riding style I like the strap adjusted a little on the loose side to allow the front to come up just enough so the back of my skis barely touch the ground under a full throttle launch.
There's too many little adjustments to try to list them all and make any sense of it, but I'd say to start with what I listed above, and it should at least give you a decent starting point.
