No Second Guessing After V1. Ever.
To preclude any second guessing after V1, our SOP has the Captain's hand come off the throttles by V1. Once the captain's hand has been removed from the throttles, our company rule of law is: "Don't even think about aborting the takeoff roll."
When the F/O makes the takeoff, the captain's hand is on the throttles, because only the captain makes the decision to abort prior to V1.