These suggestions are great, thank you! I especially like the idea of 'stunning' the robot by hitting it in a particular area. They do take double damage if you shoot them in the side cameras, BTW, but it doesn't slow them down.
I will work on getting better feedback, especially sounds as you mentioned.
I'm not looking for any help right now, but things will probably ramp up in production in a few months so maybe then?
Thanks for the great help and support!!