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Dialed up Pitcher aggression rather than dialed up batter aggression. For instance, a higher rate of fastballs up in the zone because even if hitters catch it, there's a high chance that it hangs in the atmosphere. Similarly, a pitcher might be less worried about walks because a base runner is a lesser threat to score for the same reasons. I also don't think that King Felix would be affected by such things for the same reason Giancarlo Stanton wouldn't be affected by Safeco. The talent overcomes the park. For the non-Hall of Fame part of the team though...This year's split for instance, has the Mariners' Pitching Staff at 7.5 K/9 at home and 6.9 K/9 whereas the rest of the AL is almost no split: 7.5 vs. 7.3.