By the context I'd also assumed perf A and would certainly agree that the calculated /nominated V1 is the decision speed and you continue unless you literally cannot get airborne...
There is also the issue of (reduced) derated power for jet takeoffs (thrust amongst other things varying on aircraft weight) which complicates any thoughts of comparing performance across visits.
Above all If something happens above V1 but below Vr having a debate with the person in the other seat about "I know from a previous visit we can probably stop" perhaps followed by, " Ummm, is this a serious/catastrophic engine failure or not" is possibly not going to end well...so the KISS principle applies.
Last edited by wiggy; 14th Mar 2017 at 22:16.