If you want to carry games in 1300-1400 elo, don't Jungle. It's better to play AP mid or AD carry and stomp your lane which put you far enough to make a difference in team fights. As a jungler you'll be behind even levels anyways and even if you're fed, you probably won't be that far ahead. I got to 1700 elo rather easily just playing AP mid, but on my sub account i'm just 1360 right now and having a hard time getting higher from just playing jungler.