"far" and "very" are adverbs. Their usage is OK your examples. "too" is also kinda intensifier. Unless you have valid grounds, far/very with "too" is considered redundant.
Enkatesu has no business giving advice. The correct answer is #1: "This is getting far to strong." (Though the subsequent sentences appear unrelated.) I'm afraid the reason why #2 is wrong is idiomatic. "Far" amplifies "too." But "very" weakens and is reduntant with "too."