There is currently a huge bug with Ultra-Capacitors where Blizz somehow changed it so the upgrade gives 50% additional attack speed per upgrade instead of 5%. This bug has unfortunately not only hit Blizzard maps, but also custom ones, as well.
Until Blizz fixes this, I highly recommend people to NOT play any mission of Annihilation where you face off against Terran. If you don't wanna get smoked, that is. :P