Have you scaled it? When I scaled mine I was surprised that it was actually pretty good but I had one large battery on each side of the fuel cell in the trunk.
After moving the left side battery over to the right, my car leaves level and high! What a difference it made for such a small change. It was a 108lb. swing moving it from the left to the right. So it makes sense to me that it worked so well.
Also tire pressure in the rear slicks, ladder bar adjustment, shock adjustment, tire circumference from left to right, etc....can all play a part in a crooked launch.
I would scale it first, and make it right then go from there.
Nice Duster!!
Brian