IMO, tutorial isn't enough. You gained theoretical knowledge that way and, even then, it does not catch everything you need to know to win. What you lack is practical experience.
So, my only advice to you is, play more or lurk more in the forums to see some strategies.
If you can access the beta threads, you could see bundle of ideas or tactics in there. Just a warning though, it might not have been updated to the current version of the game.