Oh darn, I might've just solved it, I added another game capture and put it on CSS, which fixed the ping and the black screen, I didnt have any game capture on specifically css xD
Can't I have 1 Game Capture that captures all the games? :(
And it also doesn't explain the 700 ping on LoL
EDIT: I'm kidding guys, still have high ping on all
EDIT #2: Twitch says that the stream configuration quality is "Excellent" which is their highest. It all is great now, the last piece of the puzzle is the 700 ping I get on every game once the stream goes live.