Those are tough, because you have to find a perfect rhythm, as close to the cones as you can get. Leave too much clearance and it takes too long. Another thing is turning in on time. If you change direction as you pass the cone, it's too late - you should already be leaning into that turn. Your direction change happens as you cross the center line.
In the early ones, you don't have to lean so far. Stay up as much as possible, and on the first 2 or 3 cones there is a brief period you can stay perfectly straight, aimed for the next turn-in. With the bike as upright as possible for as long as possible, it accelerates better.
Also, tuck. Lowers your CG, making the bike more agile, and at the top end, where you're up over 80 and 90 MPH, it reduces drag as well.