Hahahahhahaa! That's hilarious. You would have to completely change your strategies if your units barely take any hits. For example, the counter to everything Zerg would be Wraiths or something bizarre. (As long as hydras didn't have range)
Building placement is bad. Too many medics. Science Vessels don't stay out of danger(or cast any spells?). Most of the time lurkers are sitting there and the AI tries to attack to the lurker without vision.