You're probably right. The reason is because we leave pitchers in until they give up "too many" runs. If everyone had their pull ratings at 4-5, scoring would be more balanced. Our pitchers seem to fall apart pretty quickly. Which is probably due to in-game fatigue. We look at a 24/72 DUR/STM and say "He can throw 85-90 pitches every fifth day." And he can. But his effectiveness doesn't carry through those 85 pitches.