Ok, I have a few questions I'd like to get some help with. Firstly, I have a tendency to win lanes more often than not. Either from kills and cs(which I need to improve on, 120@20mins doesn't seem high enough), or simply by zoning them completely. Pretty confident in my laning phase, especially with Jayce. However, I have troubles winning games. It's partly due to one lane feeding or no cooperation, but I feel like I should be able to take a decent laning phase and turn that into team fight domination. It just isn't happening.
I try and position myself as well as possible, I play fairly safe and I am quite decent at targeting the most correct opponent. But, despite this, it's a no go on the team fights and I feel like I am letting my team down. More importantly, i am letting myself down. I have been in about 7 placement matches now, and I just can't get out of bronze V, even though when I play against silvers (when duoing with a friend) i preform much the same, or better.
So, any tips on how to improve my middle to late game presence in the game? A good youtube clip or something? I just am having trouble taking hold of the advantage my laning phase gives me.