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And if anyone's feeling extra-generous with their time, perhaps they could tell me why 3-betting only the best hands, but calling the weaker defensible hands, doesn't result in giving away too much info.

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KJs is far from 'only the best hands'. I will 3-bet lots of strong hands against a button raise. I will also call with the top premiums as well as the defendable hands. Sometimes I will 3-bet smaller pairs, sometimes I will call with them. I will almost always 3-bet with 66-JJ as well as ATo+ and KJ, KQ.

Calling with the real premiums is enough to make my BB steal defenses pretty much unreadable. My calling range is wide enough that I can have a piece of almost any board, and my 3-betting range is wide enough for the same.