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You are not understanding that every player in the league is also getting a 5yr recalc and the results do not happen in a vacuum, they happen relative to the other players in the league with respect to the league totals while the modifiers keep everything in balance.
MLB BA by season
1909: .244
1910: .249
1911: .266
1912: .269
1913: .259
1914: .250
1915: .248
Notice that big spike in league BA in 1911. That is when they introduced a more lively baseball and Ty Cobb and Joe Jackson both batted over .400 that season. Then in 1912 they both nearly did it again with Ty Cobb batting .409 and Joe Jackson batting .395.
Consider 5yr recalc for 1912 which includes the 1910-1914 seasons. Ty Cobb batted .396 over that period, while the league batted .259. For the 1912 season we take the Ty Cobb 5yr recalc and divide by the 5yr league average which represents the rest of the players in the league, then multiply by the 1912 league BA of .269. This becomes (.396/.259) * .269 = .411. In OOTP he actually batted .404 in the 1912 season, which is very close to expectation based on how recalc works.
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