very strange wear / deterioration marks, if it was mine i would worry,............ unless I knew that I did too much skidding/burnouts/popping wheelies!!!
you need a dual compound for the commute, not sure if the bridgstones are, as its not one I have used.
I have the Michelin sport tour 2CT on mine at the mo, and very happy with the grip levels, and the dual compound looks to be working, but not enough milage yet to be able to predict how long they will last