[Aaron W.]

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1. Opponent is passive calling station, who raises turn bets if more than second pair, but calls down with A highs and low pairs.

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Don't call his turn raises with worse than top pair. Value bet your middle pairs and don't bluff the river.

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2. Opponent is ultra LAG, calling/raising practically every blind and leading 70% plus of flops and turn. (this seems, rather pathetically, my type of play).

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Play hands that like to see showdowns, and get to the showdown without making every hand an expensive confrontation.

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As i've been (over) aggressive, I'm faced with a lot of turn C/Rs. What should I do to a) stop getting caught like this, and B) When C/Rd holding 2nd/3rd pair?

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If you think villain is aggressive enough to bluff check-raise, then check the turn and call any bet on the river.

Heads up play is more aggressive, but it's not about blind aggression. Get to know the villains and play in a way that capitalizes on their weaknesses. Also, study your play and learn what your weaknesses are so that you can fix them.