In my online league, in the OOTP5 days, I'd use a 4-man rotation. Never had a problem in 4 years, the 4-man rotation would work just fine.
However, with OOTP6, it's a whole other ballgame. Two weeks into the seasons, the computer lists pitchers as tired even after three days rest, which wasn't the case in OOTP5, with the exact same pitchers (endurance ratings: 8, 9, 9, 8). The computer uses a 5th man for the rotation even though I set it to 4-man, which doesn't please me at all

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Anyway, I tried changing the league settings (typical rotation: 4-man, pitcher endurance: Very good), and pitchers on three days rest were still tired (although I did not sim under these settings, I suppose that's something I should do).
A board search didn't help me, can anyone?