When learning how to trick it takes time and patients. I can guarantee you would learn it in a day. Just keep on pumping out tricking replays and experiment with different setups. Also it's better to actually know the trick or setup rather then reading or watching a tutorial so you can do the trick in many different circumstances. Hope this helps because I had the same problem and I understand your pain.

Also, always keep the gravity on -30 or you'll just get used to some other gravity setting and have no clue how to trick on -30.