Of course you'll continue after V1/rotate.
Which means you'll have max thrust on the working engines - precisely the Vmcg scenario. Vmcg is irrelevant once the decision to abort is taken - which is why it sets the lower limit for a safe speed for a continued takeoff OEI.
The wet & slippery runway argument is basically nonsense (and I say that even though I've seen it used in our cert reports too) - unless you somehow magically eliminate the sideforce generated by the mainwheels, you will NOT get the same behaviour "dry/NWS off" as you will "wet"