Back to basics
If only they had built the aircraft with some sort of forward facing glass panel so the pilots could look forwards and take note of what was going on ..
I seem to be flying a lot of odd weight freight these days, and the "70% of V1 by 50% of the runway" rule works well for us. We aborted one last month that seemed a bit slow ... nailed it faster and harder the second time around and got the numbers up.
If you are just "flying the numbers" that the FMS says are right, then you are not a pilot, you are a passenger.