[Bielsko]

100 energy to kill a HT sounds good to me, 1 infested terran then fungal. Seeing as the zerg psionic storm upgrade gives you extra energy instead. If you think about it you don't even need to fungal just use enough infested terran to get below 80hp.

The only reason infestors have the stun ability is because zerg has low ranged units. Just spread your attacking units, like you suggested to the slow moving HTs.

I don't think you can say the HT vs Infestor match-up is not broken with a straight face. EVERY statistic is better, it all comes down to lack of skill from the zerg player for HTs to do anything to infestors. Greater range, much faster speed, moving burrow, detection, no friendly-fire, ability to control units that cost 3x as much as the infestor, and even greater damage in most cases vs armoured. (As storm is easily dodged by speed roaches which will end up doing about 40 damage.)

In the sc2 help menu, it says that HTs are the counter to infestors but that just is not true.