Grenades are like RAM, you can never have too much
i geuss i could upload mine, but just so you know it disables achievements unless you start from the beginning of the mission (for campaign complete achievements you have to start from the beginning of the game)
also if you hit new game you can select one of the previously played missions so you can go back to whatever mission you were on it should only take you a few minutes to an hour to get to whatever spot on that mission you were depending on how far....