Help me get out of Crusader

So i was mainly pos3 and climbed to Crusader 4,but i started to feel that i cannot change the outcome of the games, no matter how good i did,killing,roaming space creating,there were carries and midlaners who get tilted and will cost me the game so i decided to play pos1-2. I climbed to crusader4 again,yet i had some crazy teammates(Jugg pos3,Kunkka pos1,experiment stuff)and to be fair i got tilted after some of these matches and again dropped to crusader 1. Now there is definitely a lot of skill issues so im putting some games here so maybe you guys can help me.

Game 1: 8108951627 (Im slark) Game 2: 8112832466 (Im WK) Game 3: 8112049954 (Im Cent)just look at this clown viper Ult on shadow shaman xD.he was saying that he gonna get silver edge for BB.

I appreciate hard truths and tips about my gameplay. Thanks.