I went through the same cycle, when I first came to FTR I was a real weak/tighty, and I desperately wanted to get aggressive. Here's what I did:

1. Decide I am going to play SnGs/MTTs to practice aggression.
2. Read Ripptyde's MTT strategy.
3. See #2.
4. See #3.
5. Think about Ripptyde's MTT strategy, try to execute some of the strategies explained.
6. Talk to Ripptyde, he'll help you out.
7. When Ripptyde's SnG strategy came out, I also read that 5 or 6 times.
8. Move to ring and try to execute some aggressive strategies.
9. Making money is fun.

Now I'm one of the most LAggy players on FTR :P

Good luck. Shoot me a PM if you ever want some help.