Liking the update but I have found the Autocannon, Rotary Cannon, and Scatter Gun cannot destroy a Command Center before they call in reinforcements.
I have the element of surprise and are focus firing them but they still get the call out.
I almost thought the call in was guaranteed until I tried with other weapons.
The Rotary Cannon and Scatter Gun I can understand not making it.
The Autocannon seems to destroy them right as they get the call out.
I think the calling window being slightly extended to make it so you just barely succeed with the Autocannon would feel better than just barely failing like it currently is.