I agree with Brettski. The deck looks amazing and anything you do now, will more then likely make it worse by the time the wood finishes doing all it's shrinking. If you are lucky, it won't shrink and you can what you think is best, but if it does shrink, there is no way of predicting how much or what boards.
I've had 5/4 decking that I installed as tight together as I could get it, shrink to create a half inch gap in a few months.
With winter coming, I'd wait until late spring before doing anything.
Eddie
