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1) My stack size tends to gradually dwindle, until I am forced to make a move at a marginal spot...Nevertheless, I always end up with less than my starting stack after the low-blind phase is over, since I'm not getting enough of these hands preflop.
Welcome to the animal that is MTTs. This will happen to you a LOT when you play them, almost every time in fact. You don't have the luxury of "sitting back" in MTTs as you would with SNGs. The key is to just take advantage of every good spot you find, pick them
perfectly. Knowing where they are is the real issue. I've been playing them for years and still have plenty of trouble. It just takes practice and refinement. Sooner or later, the spots start to become all too familiar and you'll know them when you see them. Basically, my suggestion is to just keep trying and play optimal aggressive poker.
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2) In two of my last three live MTT's, I have gotten knocked out (or close to it) with an awkward stack size of about 15 BB in early position.
With 15 BBs or less, why are you
not shoving pre with JJ or AK? It's important to know that once you hit 15 BBs or less (and especially 10 or less), you have no moves other than shove or fold. You mentioned you're reading Harrington Volume II right now. When you get to it (if you haven't already), pay EXTRA attention to his M concept and his inflection points discussion, it will change your MTT game for the better
big time.