Yeah even with my P255\35ZR20s Nitto NT555s with traction control and stability on I can swing the ass around if I go medium throttle and those tires have really decent channels for water, its the larger wider blocks that are the culprit unlike more standard m+s tires where there are more channels more blocks but less surface area to them. The summer only or all season ultra performance tires are still not really suited for spirited driving in the rain like that.
As a matter of fact I found it harder to swing out the rear with my Pzero's than my Nitto tires in the rain, but it was reverse on dry pavement due to the tire size and different block designs.
You will just have to adjust your driving style for both. You should not have hydroplane issues in strait line highway driving other than excessive puddles.