Minute management is as important in this game as any aspect. Knowing when to save your resources ($$$) and play for 5th (although that isn't such a great move anymore) and when to go for it is also important. If you go all out to win every game every week, you end up much worse than if you manage strategically.
One aspect that has always been tough for me is juggling getting as far as possible in the cup and not giving up league wins. Sometimes the decision is made for you by being matched against either a bot or otherwise weak opponent or going up against an NBBA squad. A lot of times, though, it is a tough choice, It is one of the things that makes the game enjoyable.
Not sure I would call you a sandbagger this year, Peluin. You are rolling!