Strength: affects hitting power, board play and a modifier to shot power.
Aggression: affects likelihood of taking a penalty, so higher aggression increases PIM chances. Also affects how much a goalie will challenge shooters as opposed to playing deep.
Poise: Players “ mental toughness “. Like you said, ability to make clutch plays.
Hand eye: Higher hand eye means better deflections, puck pick ups and helps with dekes.
Offensive Awareness: Better offensive zone abilities, a modifier of sorts. Doesn’t equate to scoring more, just overall boosts to playmaking and pick ups.
Defensive Awareness: Modifier to defensive zone abilities like pass interceptions and tie ups.