In a 164 chase, does the game get decided more by game awareness (rotating strike and minimizing dots) or by one decisive over that completely shifts momentum under pressure?”

I'd say game awareness wins you more chases, but one big over against a weaker bowler can seal it. 164 isn't huge — keep the board moving, don't panic, and pounce when you get that one loose over. Simple, but hard to execute under pressure!