Stop Ganking the Tank
I don't care if that lane is behind, that tank isn't going to die anytime soon. Help the lanes that have enemies that can die quick. That way, the lane can be pushed and you can get back to your farm. Guess where the squishy guys live? Usually in mid and bot. Guess what lanes you should gank? If you answered, 'anywhere but top' YOU ARE CORRECT! Making top lane feel good about that one time you helped kill the tank isn't worth losing the entire game. If the enemy top is tank, don't bother. If the enemy top is squish then, by all means, dig in!
Sincerely, someone who plays top and jungle.