You might want to move that bike back. You're putting a lot of weight on the trailer tongue. In this photo (first track day) I've got the chock as far forward as it will go. See how it's making the car squat?
In the attached photo (sorry, Photobucket is not cooperating today so I'm having trouble uploading) I've moved the chock back and everything is much more level.
You want to have maybe 20 lbs of load on the ball... i.e. there should be some weight, but you should be able to easily lift the tongue off the ball. You DO NOT EVER want to have the center of gravity of the trailer behind the trailer axle. Not only is that a Bad Thing if the coupler comes undone, it's what makes trailers fishtail.
The c.g. of the bike is roughly at the crankshaft. Put that a few inches forward of the trailer axle and you'll be about right.
