I would try setting it to 4 or 5, but be careful your hitters (at least your good ones) cannot be pinch hit for in the advanced settings or you might see too many pinch hitters
another thing to consider is the pull setting for your pitchers, I'm not 100% sure about this but I'm pretty sure if you have a reliever with the pull setting at 1, the sim generally won't pinch hit for him until he's going to come out of the game the next inning anyways. so set the pitchers pull setting to 3 or higher, but this may lead to your starter getting hooked earlier than you might have liked. i generally don't like my starter getting pulled early even if being shelled as its not like real life where pitchers sometimes don't have it, sim pitchers have the same stuff every appearance and i don't want to waste the bullpen. but you might want to do something different.