well moving that striker seemed unsuccessful. I didn't bother trying a hammer, I just loosened them and tried moving it around by hand to see how much it could go. The screws are counter sunk, so when they are tightened they recenter the striker in the same position it was in. Unless I overlooked something, it doesn't appear adjustable. Maybe the hammer method actually bends the metal in the holes?
I sprayed white lithium grease in the door latches and worked it in by moving the latch back and forth while holding the door lever in the open position. I let go of the lever and attempted to push the latch into the closed position by hand, and it was very difficult. I think the problem is in the door latch itself. Whatever part causes the resistance in the latch seems to have stopped working very well.
the next step is to remove the door panel and get access to the inside of the latch to look at it. I'm not sure when I'll do this but for the sake of solving this problem and having a record of it, I'll post any results back in here if I do it. I want to fix this because if we keep slamming the doors like this, I feel like its going to knock the door panels off eventually.