Lowering the V1, to me is a "ground" problem. Trying to get airborne with a lower V1, begs the question. Will the aircraft accelerate, in distance, between the reduced V1 and the rotate speed, should there be a power failure just after the reduced V1?
I would prefer to run off the end of the runway at low speed should there be a rejected t/o, than be off the end of the runway at high speed and at full power, trying to get airborne.