Failure in the Main Event

My success rate in the satellites for the $11k Gtd and $16k Gtd on Betfair is pretty good, qualifying from one in every three satellites I enter. The rate goes up for the 10 seat Gtd satellites which are usually my first attempt at qualification. This gives me pretty good value with an average buy in cost in the $11k Gtd of $36 as opposed to the actual buy in of $82.50, and an average cost for the $16k Gtd of $48 against the full buy in of $109. I'm actually getting in to them for less than half price. Its all the more frustrating then, to find out that my record in the actual Guaranteed tournaments themselves is pretty awful.
Apart from one tournament, where I finished 4th for $880, I have failed to make the money in any of the main events, and the cash I did make was assisted by AA and a double up first hand.
The tournament always seems to go the same way, I lose a couple of early pots, where I stay in with draws, because opponents give me the odds to do so, then I tighten up because I feel I'm below average on chips and blind away for a bit, then a crucial hand comes about, and I have a big decision to make, to either fold and leave a lot of chips behind, or take a gamble. I always seem to take the wrong decision, or if I take the correct decision, lady luck kicks me in the teeth.
Last night I pushed with AK pre-flop from late position to try and steal a few chips, I get called by the BB with AJ and the first card on the flop is a Jack. Today I raised from LP with AQ in a multi-way limped pot and get two callers from the blinds, flop is harmless looking 2 6 T rainbow, its check to me so I push in to steal (definately not the best move I could have made) and BB calls with 66 for a set. I feel I need a little bit of early luck to settle down a bit and get 'in the groove' once I increase my starting stack I can relax and play my normal game, losing early chips makes me edgy and this leads to bad decision making on my behalf.
Maybe its because the buy in is a bit high by my standards and I feel a little uncomfortable, I seem to want to make moves rather than sit back and play the same way as I do in the satellites.
Overall though, I'm enjoying playing, though a little profit would enable me to enjoy it even more, and hopefully I'll get to play live tomorrow in the £5o freeze out.