Okay so over a month ago I ordered an Optima tailbox shown here...
http://www.rbr.info/images/stories/lowracersale/optima-baron-tb-1.jpg It mounts to the back of the seat and after some minor adjustments and noise-proofing it worked well in fact it added around 1 to 1.5 mph average and on top of that NOBODY COULD DRAFT ME! Only problem was it allowed very little clearance between the tailbox and tire so I removed the fatter rear Kojak and replaced it with a thinner Stelvio. This worked well for about 2 weeks until Saturdays Peach Pedal where apparently the rear tire rubbed against the tailbox and ruined the tire....Tailbox is now off the bike but if you can get one GET ONE!
This leads me to the 2nd issue tires. the Schwalbe Kojaks were getting a bit worn so I though I'd try the Stelvios again and order the new Duranos for later. Here is my take on them
Stelvio = Decent tires however due to the higher pressure they have a rough ride, I always worried about pinch flats on some of the bridge joints at White Rock. Okay speed but no idea how durable they are as far as mileage. I put on maybe 500 miles on them.
Durano = Supposedly the Stelvio with a slightly different tread pattern, I had them on 2 days and got a pinch flat, seemed to be not quite as rough as the Stelvio. Speed was okay and supposedly they will last about 6,000 miles although I put on maybe 60.
Kojak = Bigger tire than the Durano and Stelvio (1.35") however is it really faster? Who knows but it sure does feel like it. As an example Sunday morning on the Duranos I managed 19.6 mph after 4 laps around White Rock lake, Sunday evening on the front Kojak (Durano still on the back) I managed 20.3. No worry about pinch flats, much smoother ride and the last pair lasted over 4,000 miles with plenty of tread left.
So if you are in the market for new tires give the Kojaks a try, I like em almost as much as the old Vredestein S-Licks.