changed "VR >= VMCG" into "VR >= VMCA", typo
I'm a newbie, and I might well be wrong, but here's how I would answer your question, Robbie-Rocket-Pants:
V1 for the wet runway will be slower than V1 for a dry runway. This is because
a) the screen height can be reduced to 15 ft which reduces TODR and
b) reverse thrust may be taken into account for the stop case which in many cases will decrease ASDR.
On the other side, VR is still limited by the requirement VR >= VMCA. In other words, V1 decreases while VR cannot decrease.