Vr and V2 will definitely
have increased in value and probably V1 subject to ASDA.
But we didn't know about
the increase in weight.
Once V1 has been fixed
and you've started the take-off you can't change it.
What we will notice is
that the aircraft doesn't lift off at the speed we expected but at some point
later down the runway.
We can therefore say that
the safety margins have been reduced.