Hey Jonathan,
It sounds like this is really being influenced by the rest of your exhaust system. Do you have headers or a stock exhaust? If your exhaust system has a "flex" as in stock or DC Sports you may be able to adjust the hangers a bit to get it better, but I doubt perfect. I have RM headers which have no flex, just a slip joint on the flange. I have the Tubi and it is close but not perfect and I cannot "adjust" it any more, except if I lossened the headers from the heads and shifted them around, not sure if it will help though.
Frankly, for me it is just not worth it. I was able to bend the hangers to insure the pipes are not touching the valance, but they are not "perfectly" centered either.
Sorry I don't have a solid fix for you, but maybe you can get close with a hanger adjustment.
I would ask Chris at SoS if he has any recommendations. I know he carries these, and my guess is you may have gotten them from him.
HTH,
LarryB