Tournament Help

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Ok this time i have more information for you guys to work off of. Ussaly these are tournaments of 2000 + players. I can ussaly get to under 100 easily but then i strugle and cant finish it out. I ussaly get my stack up to 30-50k but then i cant do anything. I get cards like AK,AQ but i can nvr hit a flop or win a pot. Im ussaly around average stack and the blinds are ussaly like 800/1600 - 1000/2000. I think that my problem is i stop raise 3X BB and just calling. Also if im holding A/K or A/Q and I miss the flop like say the flop is 3/6/10 should i take a stap at the pot and how much should the stap be? 2X BB / 3X BB ?

Thanks.