Yeah, I think I'm definitely Ne sub, especially compared to my other IEE schoolfriends. Isha pointed out that Ne/Si dominate my personality to the degree where other aspects aren't really distinct (although, curiously, she sees herself as being more outwardly Te/Fi and yet Si sub; somehow I'd rather frame it as more obvious Introversion. Also, I can't remember her exact words, so no accurate information for you!)
In what ways could you see Si subs as cranky? One of my friends is in the cadets, and even when he was fuming about inept subordinates or something, he didn't strike me as being as outwardly emotional about it as, say, my design'n'tech teacher getting mad at the class for being late with their design plans. (SLI-Si and SLI-Te respectively, I think.)
Though, I think duality is still intact across subtypes. I'm still an IEE, so SLIscowl tends to slide off me (even though I prefer the Si subs' "vibes"). I haven't interacted closely with either of the Te subs I know, though, so I can't really comment further.
But yeah, Te subs aren't dangerous. They're like LIIs... it can be cute when they get angry