Your ELO is really low right?
From what I remember playing low ELO or jungling at low ELO was more about completely MASSACRING one of their players, instead of trying to give other lanes leads to squander. I remember spending more time in the enemy jungle than ganking for anyone to completely shut down and demoralize their jungler, maybe get the team angry at each other. Once they have one wholly useless champ on their team, teamfights should be easier b/c, even if your team is slightly losing the other lanes, it will be like 4.25 vs 4.
TL;DR - Pick on the bad over and over and over again, reap the benefits.
From what I remember playing low ELO or jungling at low ELO was more about completely MASSACRING one of their players, instead of trying to give other lanes leads to squander. I remember spending more time in the enemy jungle than ganking for anyone to completely shut down and demoralize their jungler, maybe get the team angry at each other. Once they have one wholly useless champ on their team, teamfights should be easier b/c, even if your team is slightly losing the other lanes, it will be like 4.25 vs 4.
TL;DR - Pick on the bad over and over and over again, reap the benefits.