How much weight do essays, ec, and recs actually carry?

Depends on the school. “Top” schools care about more than grades/scores. They reject perfect 4.0’s and 1600’s and valedictorians. Academics still matter of course; but you can’t get into a school like Harvard or Stanford based on only academics. Other colleges like maybe your in-state school don’t care very much beyond academics, but you’re essays/recs can’t be outright terrible.