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I would suspect you're not maximizing how much you win from your opponents when you win a hand. What's your post flop play like? How many of these tournaments have you played?
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I had the same problem you had when I made the switch from SNG, and after I heard this advice and took advantage of it I increased my ITM finishes.
You say you're post flop play is not the problem as you make pot-sized bets, I recommend you make the pots bigger pre-flop by raising more often and calling more raises in LP with position.
Also read this:
two plus two archive