Thanks for the feedback.
I like your idea of increasing the times for some f the injuries to avoid "fix and go" types of things. Another interesting idea would to have each player carry a set of cards and some bandages (NOT the epi or morphine) in a vest pouch, simulating an IFAK. When they go down, they would pull out the set of cards and (this would have to be tested out) either draw a card themselves and call a medic, or wait for a medic to arrive. What this would enable one to do is "buddy aid" for the minor injuries that do not require sim medications. In essence, another player would provide "first aid" for the minor injuries, but a medic is required for urgent or critical ones.