ssg,
So if your at V1 and burned up 85% of the runway, you see that as a problem right?
Yes
.
So when I see an airliner burning up 90% of the runway to get to VR. I know he didn't have the right numbers.
NO
These are 2 very different things. Have you ever flown a heavy? I see your profile shows you're on the G-IV. Twins usually get airborne earlier than the tri/quad engine aircraft but not always. Look it up!
As for the stop/go - every time is different with too many variables to list, but here are some (in no particular order):-
Day/Night, Dry/Wet/Contaminated, Calm/X-wind, Alert/Tired, Circadian time, Experince total, Time on type, Training, Company policy, SOP, Area weather (CB's), Local terrain, Area familiarity, Control restriction/obstruction, 2 crew/Flt Engineer or augmented, Shock etc, etc.