For crying out loud you are a newfag. Saging a thread does not cuase the thread to go down. No matter how many times you sage it, you cant directly force it to go off the front page. Sage doesn't work that way.
Sage just makes it so your comments do not cause a thread to bump up on the top. So the thread stays in the same place.
The only way to "knock a thread off the front page," is for no one to post in it, or for every one posting in the thread to sage. Eventually it will fall off the front page. Conversely, if a thread hits it's limit of posts, every post goes into autosage, and the thread falls off normally.
So unless you sage about 170 more times, the thread isn't going anywhere.