You should see at least a little evidence of tire scrub on the rears.
At your next event, talk to some of the more advance FWD drivers and see if one of them will take your car for a lap or two and give you some feedback on your setup (With you riding along of course). At the same time, you can see how your car behaves with a more experienced autocrosser at the wheel.
If you're not comfortable with someone else driving your car, get one of these guys to ride along with you and critique your driving.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.