Natas,
I presume that the fact you are quoting single figures for V1/Vr means that there is effectively no real V1: the aircraft will be airborne (Vr) before achieving the real V1?
If so, there should be no significant downside to using the higher figures other than you might enter the RTO at a higher energy level than necessary. Once airborne, everything should be enhanced - you will still be airborne before the lift-off point for the limiting weight and all of your speeds will be higher, thus improving your climb performance in all segments and achieving all segment end points before you otherwise would at the higher weight.
However, you need to know what the real V1 speeds are - there is no point in unnecessarily creating a limiting situation.
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Stay Alive,
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