Woodman, your exhaust sounds perfect IMO. I will be doing exhaust on my car this summer sometime and will likely do something similar to your setup.
I'm thinking part of the rattle I've had lately is a cat going bad, I think this for 2 reasons. 1st is that the rattle only happens when I accelerate and ONLY when I accelerate after the engine and exhaust is at full operating temperature. 2nd is that when I give her the full enchilada (I prefer to call myself a "spirited driver" lol) I start to smell a rotten egg smell, and both of the top techs I work with and even an exhaust shop have told me that's likely a cat going bad.