If there was one stupid thing I did during that match was when I was getting Ultralisks, I forgot that I needed that plus 2 upgrade so they can absorb more damage from the plus 3 Stalker, Zealot, Sentry combination. But luckily, they managed to thin the numbers enough for me to kill them with whatever energy my Infestors have by dishing out Fungals and Infested Terrans. And, much to my relief, I won that match.
Given that the guy had a larger base than myself, I should have lost then. I should call myself lucky, but a win is a win, I suppose
It has been a while since I used Infestors, and I like how they compliment well with Zerglings and I think I might use these guys a little more in the future.
EDIT: Another big mistake I made was accidentally pressing R when I should have pressed T on the Infestors. Ruined the element of suprise. :/