re: Poker & 3bet calling ranges
I think C9's point is that it's pretty futile trying to set up some kind of solid stat-dependent strategy here. Positional dynamic is going to play a big part here, as always with 3-bet/4-bet situations. It also very much depends on your 4-betting range. I mean aganist some opponents who 3-bet light but fold to 4-bets you're going to want to 4-bet your air light, whereas against the maniac guys who want to get AI with a wider range, you may want to 4-bet bluff and commit with AXs to give yourself more fold equity and pot equity. 3-bet sizing is also pretty important, these sizes will often vary depending on positional dynamic.
With no disrespect (and I might be wrong here), I honestly think that it's pretty futile attempting to devise some kind of pre-meditated reaction strategy, and that you'd be much better off just continuing to analyse these kind of situations you get into at the tables (HA forum, hand reviewing sessions with friends etc.). Once you've been doing this for a little while, you'll get a much better understanding of what kind of range you can carry on with for value in certain situations, and also the situations in which you want to be 4-betting light or for value, and the reasoning behind all of this. Maybe open your tracking software and filter for 3-bet pots and find a few hands where you're not sure about the best action, and post them. I think this would be a much better way of coming to understand the thought process that needs to happen in these situations.