I use a bridge street saddlebag and klickfix mount for the commute. It's like having a small parachute on the back, but I like not having weight on my back and getting a little less sweaty. That said, no reason for OP to change anything if it's working.
never understand this, personally... doesn't a front rack make a bike steer like a supermarket trolley?
(I use a Wildcat seat pack, occasionally a small backpack).