WARTHOG nice time and analysis in the park changes, but dimensions alone aren't enough to gauge a index. What dimension changes fail to recognize in the new parks (Philly/SD), is the size of the wall, same/higher/lower? Did foul territory increase/decrease? Is the hitting background CF better/worse? How will the new outfield or scoreboard, effect the wind currents? Simply looking at outfield dimensions will only be a piece of the pie, except KC, where that's the only change.
Kauffman was such a extreme hitters park, that i think 10 feet will make it neutral at worst. Comerica brought the fences in 20 feet, and the park didn't become a hitters park.
Smells Like Teen Spirit