The current highest grade for Run and Gun is said to be an A+ but if you play on a save where you have already beat the game a perfect score is a S rank. This should be updated in the rules so we don't need to have a separate save just for Run and Gun runs. I'm submitting a run right now and don't think it's fair to me or anyone else that it gets disqualified because it's an S grade instead of an A+.