The only thing that this could help me with is item builds, which seem to be... ok. I can't even really tell that because item builds are not static things, and should adapt to situations. They all look plausible, but without knowing the enemy team comp, when you built the items and why... I can't even really criticize any of that.
One thing that I have to ask is about your objective control. It seems like you have a pretty good handle on your mechanics, and from what you say, it seems like teamwork isn't the issue either... Does the enemy team usually end up getting a lot of dragons and towers after your team feeds? If not, do the lanes just spiral out of control from there?