is your 5GHz band set to 160MHz?
From my tests (using a older laptop with Intel AX200 and Galaxy S21) I was most of the time only getting 650-750 Mbit at 80MHz on the laptop and (strangely) on the S21 ~800 mbit.
at 160MHz on non DFS channels the story was flipped, the laptop saturated the 1G uplink and the S21 went down to ~600Mbit.