The Z has a strong tendency to spin out once the back end breaks loose in the wet. I'm wondering whether this result comes due to overpowering the rear wheels for the conditions, or if there's something more fundamental with the design that causes the Z to "like" to spin out.
If the answer is power to the wheels Racelogic's traction control could have saved you and the car.
Any case I'm very sorry for your loss, Eisho, but I'm relieved to hear that you're safe and still with us today!