You can disable storms or feedback on HT, at least I was able to do it via that ability interface.
I agree though that their AI is for some reason vastly inferior to Infestors. PvT is mostly broken due to the ineffectiveness of P T1 versus Reaper/Marauder combo (Marine Marauder is actually beatable). Once you get to afford 2-3 HT you actually start to get ahead, if they do decent storms and not just storm the empty space ahead of troops (sometimes they do that). Infestors on the other hand never seem to have this problem, they can perfectly place FG on even a very large force of bio ball.
If you compare them to Infestors, they are clearly the inferior unit.