+10 against psionic meaning if infestors get in a storm they die. Extra damage against psionic is so it does not affect anything infestors.
Yeah terrans don't make ravens right now....so why not give a reason too make ravens? besides detection for those infestors crawling in the dirt. Big problem with raven is the inability to see infestors before being fungal'd so need to increase sight range. What else does it effect? well detection of ghost, roaches, Dts so all around just more handy. Might get less terrans throwing scans and making 1-2 ravens.
I don't think infestors need nerfs I think the counters are ineffective.
My point of view for what it is worth.
If infestors get (basically) 1-shotted by storm, then HTs will become broken.
Ravens are quite fragile, as well as expensive. Scans are practically free. Most Terrans opt for missile turrets instead of crippling medivac production or building more starports than necessary. Ravens could be made to be more effective, and, as stated before, I like the idea of them becoming sort of psionic hunters. A sight increase could work, as well as a buff to their cost.
I have never suggested infestor nerfs, and am in fact trying to make a counter that isn't absolutely broken, yet doesn't affect only 1 match-up (which would show poor design, like some sort of band-aid).