That's one problem. The other problem is that you are rarely a positive force for your team. When you do well you end with a good score, but you don't know how to translate that gold advantage into a victory for your team. You just don't understand how to snowball a game.
Normally people gain this knowledge simply by playing, but you don't seem to learn from playing. You play a ton of games and yet you don't seem to learn anything from them, at least not at any reasonable speed. You can't even effectively refute this since you've been playing ranked for at least two seasons and you still don't last hit minions properly.
You're the only person I know who regularly has an MMR lower than the average for bronze 5 and also claims to be a good player.
So I'll say what I almost always say to you; stop worrying about your team and work on fixing your own problems. From what I can tell the only thing you've improved on is your casting speed, which is not really a praise worthy improvement.
Go into a custom match with no runes, masteries, or items and work on getting last hits only. Once you hit level 6 leave the game and start a new one. Do this until you can reliably get 5 of the 6 minions of every wave plus the cannon minion from level 1 to 6.
Once you can last hit in a controlled setting you can work on applying it to a lane environment whenever you don't jungle. The extra gold will help you not fall behind so often, and might actually be enough to push you out of bronze 5 for good. it won't get you to silver, but it might be enough to stop you from living in bronze 5.
EDIT: After watching your latest Warwick game, which at the time of this edit you are still playing, you really need to work on your items. You need to pick items that are appropriate for the situation at hand.
For instance your latest game had three AP champions on the enemy team. The only MR item you built was Wits End, and you built two armor items. Yes Master Yi is a damage threat, but his true damage makes your armor less useful, which really only leaves Tristana as a physical damage threat.
You might as well get MR/Health items like Spirit Visage and Banshee's Veil and get damage/sustain items like Blade of the Ruined King or Bloodthirster instead. Try to match the items you're buying to the situation at hand.
) to duo dragon. But the enemy jungler and their mid laner (Zed) are up in 15 seconds and it's a tanky dragon which takes longer to clear. You should be able to discern that the enemy jungler in 15 seconds with homeguards would be able to come to the dragon with his mid laner and wipe you and Xerath and steal the dragon, so you back off and maybe grab a different objective or just back.
