Ok, now I got your point. ^^
I don't think we should run 4-of
Sylvan Library. Even Zoo run only 2-of it... So far, 3 is ok, I didn't draw 2 at the same hand yet, but that would be pretty bad, I agree.
On the fetchlands, I'm reaching the conclusion that they are not needed, but I will still test them a little. I didn't even have the chance to use them to shuffle my Library because of bad draws yet... Actually, our library is so full of the same kind of solutions that, whenever I activate Library, it's not uncommon to find the piece I needed.
The consistancy it adds is something close to what I said about red splash being better than monogreen due to
Assault Strobe: We depend too much on the "final blow", the moment we are able to attack with all our power, and sometimes we just don't find enough power and stall. We lose the game due to the lack of 2-3 points of damage, and get controlled. Library digs that damage before it's too late for us; before the game is controled by them. Even played at turn 3, as in these situations where you need the last forest to play the recently drawn Berserk.
It's not uncommon for us to be laying around with 20 life while trying to figure out a way to deal a few more points of damage to finish the game.
Some testings shows that we are rarelly able to finish opponent at turn 3 (10% +/-), we can finish them at turn 4 something like 40% of the games, and 30% at turn 5. A library @T2 can dig you to 5th draw within the next turn. And if you got enough life, it can dig you to the 8th draw within T4.
Well, It may not be the bomb we always needed, but at least is worth a try, I assure.
Oh, and btw, it helps a lot against Chalice @1 ^^
edit: God, that's a bigger answer than I thought... I should stop being so extensive xD