There are so many things here... I'm tired... I'll vomit this up real quick, and then I'm off to bed.
1. ITM is overrated. Don't play for ITM, because if you just play to get past the bubble, you're not going to make money play MTTs. Usually, unless you final table, MTTs are a waste of time. Play to go deep.
2. Obviously, if you play ultra-aggro, then you're going to experience more ups and downs. This isn't bad if your ups are better than your downs, but you have to be careful. The conservative player will be waiting to pounce on you.
3. Don't think that just playing ultra-aggro is the best way to play. It might yield immediate results, but ALWAYS keep in mind: you'll be most effective at a NLHE tournament when your playing style is opposite that of your opponents.
Harrington on Hold'Em, Vol 1, pg 19, last paragraph, and it's highlighted. (Oh wait, that's just my copy.)