The problem with the RS-As didn't really feel like hydroplaning, as they were very stable going straight, no matter the amount of water on the road. The problems arose when turning, as any application of power would suddenly cause them to lose grip even at relatively low speeds and with not much more than a wet surface. I got pretty much sideways on a highway on-ramp at about 45 MPH during a very light shower.
That said, they made the lower power of the NA a lot of fun in the dry, as they were really easy to put into a mild and very controllable drift.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked