[Jeffage]

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Why does raising the flop make such a difference in deciding to call or fold the turn c/r?

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If you raise the flop, he may checkraise the turn to represent an overpair hoping you fold a smallish pair. If you call the flop, he might think you will raise his turn bet or you're not folding. Then when he checkraises you, it's more likely to be a much stronger hand. It's hard to explain (and I may be wrong), but if someone raises me on that flop after the pre action, I might be less concerned about his holding than if he flat called.

Jeff