A decision to reject a takeoff immediately after V1 must not be taken lightly. My worry is that in the inquiry afterwards, some smart investigator is going to cross examine you as to the meaning of V1.
Smart-S: You made the decision to continue the takeoff at V1, didn't you ?
Pilot: Yes.
Smart-S: And then you did something totally contrary to your decision, didn't you ?
Pilot: I had enough runway and no one got hurt.
Smart-S: Answer the question. You ignored your own decision, didn't you ?
Pilot: ...
