Is the bolt bottoming out at that angle? If so, try putting the front bolts in first with no other bolts attached followed by the rest of them. That is what I had to do with mine due to mine being lineX.
I ordered mine from Ford Performance as well with installation. My dealership installed it, for the price I paid Ford Performance price no questions asked. The worst thing was, I had to go back and cut the zip tie extensions (long end of zip tie after tied) off for a cleaner look.