Just finished my Silver to Gold boost, and we got there in a couple days. To the guys having issues with the losses. I was duo Q'ing with him, so I can verify there were heavy trolls in some of those games. So don't get discouraged, he's a good guy and he'll get you to where you need to be. Because he was duo Q'ing he had last pick every game and it forced him into roles that made it harder to carry.
I'd recommend this guy to anyone.
He got fed and controlled the flow of games even on champs/roles he doesn't play often. He's legit.