So here is a relatively common situation. In walks a monkeylord, killing all units in sight. It almost is dead, and then it kills one more pgen. Suddenly it gets of huge boost in HP and is allowed to continue on its rampage. Players will control-k their units which could potentially damage the experimental rather than risk feeding it veterency, which seems more than a bit silly to me.
Why not have it so that when a unit gains veterency, it gains the ability to have increased hp, but does not instantly gain any hp? Leave it alone for long enough and it will self repair up to its max hp, but not instantly gain any points when it increases veterency? I know it would be a big change, but I don't really like the way it is currently with the instant gain of HP upon vet increase.