I had rattle in the exact same spot as you with the same TXS system. I managed to successfully bend the heat shield out of the way. Many people have removed it all together. You will get heat soak into the cabin on very hot days in summer, but you will likely otherwise be okay. Doesn't hurt to pull the pipes all together and wrap them, but they have to be off. I personally wouldn't use longer hangers solely because it would look terrible and cause clearance issues, but that's just me.