i think you will find is that the standard length of a stock shock is 13 inches. the air pressure for the e-3 is: rear=42 front=40.
John is correct

The usefulness of the stock shocks don't last long and that may be whats giving you the "eyeball jarring ride" you are experiencing.

Progressive shocks are kind of pricey, but worth every penny.
As far as your tires, they are a great handling tire...wet or dry. And many of us are getting close to or more than 20,000 miles out of the E3's. That all depends on how aggressive you ride.
