Thanks everyone for the advice, which turned out to be spot on. It was my assumption that the screws turned in the standard direction. Previously I had over-torqued it in the wrong direction in an attempt to loosen it. Instead, it bent the parallel soft aluminum bar into each other in the center and narrowing the gap between them by half. I was able to reverse the screws to take the tension off, then simply pry them back to parallel, and mount it without any issues.
Thanks again