Help Please

I installed the titanium tube on my V-Core 3.1 400 and I am little perplexed with my mesh now. It was relatively flat prior to install accross x and now I have this bow. I have loosened and tightened all screws on the x rail a couple of times in order to 1.5 NM. Any thoughts? It's also a little strange that the bow is less at the front.