Is angle of roof carrier an issue?
 

When I mounted my roof carrier (a Thule) on the roof of my CRV it was parallel to the ground. Now on my 2010 Santa Fe, I mount the Thule on the cross rails and it is angled slightly upward. Is is possible it might make for an unstable drive in a windy area? Should I shim the back of the carrier to make it parallel to the ground? Am i just being goofy?