IMHO, i tried to go F5 and under for a super reviever like Eck or Wilhelm to maximize his time in the game, but he kept getting blown to smitherines every time he went that low. I no longer do that for anybody. I most I will do is to set it to pull him at F7. Same for starters. Even for Pete, if I set him to F2,F1 - he gets destroyed on his way down to that fatigue level.
Your mileage may vary, but I had to stop doing that.
