He throws a two-seam fastball now (87-90 MPH), but every now and then he reache's back and throws a 93-95 four-seam fastball (he's done it two or three times today). He probably feels he has more control on his two seamer and prefers the movement over the velocity.
I think it's a combo of wind speed and the new roof. The hole (or gap, whatever you wanna call it) right before the roof probably causes a vacuum. We might experience the same type of wind effects that Wrigley experiences. In other words prepare for seeing lots of HR's hit in bunch's.
Hey, i don't blame Billy, I just lost all my confidence in him last year. Hopefully he makes me look like a little whiny b**** and kicks some ass this year.