I sure hope this is the issue. I have the exact same thing going on w/ my car. And when I accelerate through a turn it feels like the back end is sliding out on me. DSC kicks in, etc. It's really frustrating. Actually I was having a hard time keeping it straight in my lane on the expressway. Every time i corrected it felt like the back end was slow to respond. Then the thing felt squirmy.
Just got my new winters on Friday, so I'm hoping this disappears... if not, I'm not going to be happy!