It's hard to really comment on some of this stuff as it varies by level/stakes I'd imagine.

What I do know is, that I 3-bet people with fold to 3bet stats > 65% like madnessss and when they do finally call a 3-bet I just play carefully or c/f with air.

I'm not saying that your high fold to 3bet is bad, but just that you should look out for people who might know this and be exploiting it. You can up your 4-bet bluffing against these ppl, or widen your 4-betting value range to include things like 99/TT and stuff.