That scenario happened to a lufthansa, not the jammed elevator, just not enough authority to rotate. It was a combi variant and at the most forward position instead of an empty container there was one containing over 3 t of freight.
They rotated on trim, did a circuit and landed again, with a trim at the nose up limit if i recall correctly.
Anyway, large spreads between V1 and Vr are kinda common on the A320, especially on a wet runway. Usually the performance program offers a range of possible V1 speeds, and if one is go minded he will usually chose a lower one, although i would take care not toget too close to Vmcg personally.