For that matter, regarding math, why does a top Rapture 9 Iron, rated at 125', go 135'+ when struck at 100% with no wind and a level shot field?
In some games, they have the meter go above 100% to allow for an overswing to milk a little more length from each club, but if you overswing, you lose some forgiveness from the club. So a slight miss hit will react more drastically than a miss hit 0-100%.