Stop buying medkits early game!!!! Save copper!!!! Heal Efficiency will reach over 120% by Act 1-2. Buy bandages only. By around act 1-4 or 1-5 you gain medical professional which allows medkits to heal trauma. At this point in the game you can buy bandages and have your team hold medkits or go full medkit. (only upgrade team support upgrade ONCE to green) bandages and medkits will full heal.