Nap Lajoie has the highest wRC+ with <15 strikeouts with 400+ at-bats in a season, with 186 wRC+ in 1901.

highest wrc+ with less than 15 strikeouts with 400 at bats all-time in a season
Interpreted as:
highest wrc+ by a player with less than 15 strikeouts with 400 or more at bats all-time in a season

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