162 will be very fun and will be pretty ideal in terms of width. You will have all likely freeride stance options available for your size 11's without problematic toe drag issues. The 159 is a hair softer but also narrower and with your specs, I like you on the slightly larger board. I would not worry at all about the minor flex difference. The thickness in the center of this deck is noticable reduced (gotta love C2) and allows for a lot of rider controlled twist. The Flex ratings do not reflect that.