The Michelin X-ice 3 tires we put on our Cmax are awesome.... I think the Cmax with good snows will tackle anything within reason.
We just had our first snow fall of the year... I would say the performance with snow tires is so so compared to our former cars which all had snow tires. The rear end does lose traction more than I thought it would....
I noticed the same thing, but I'm surprised anyone else noticed! You must have really good road feel, something I've tried to teach at drivers' schools only to realize it's a gift, not a skill.
What I'm sensing is a very subtle slide, nothing I'd characterize as "losing traction," but rather the rear end is "tracking" the front end around the turn. FWD tends to oversteer, but on dry roads, the C-Max is quite neutral at the limit with very little understeer if you've entered the turn properly. You'll recall I've activated the roll stability control on occassion, so I've been to the limits of adhesion and this car is very well behaved at the limits. That's the only sense of oversteer I sense, and it's a comforting one to me.
That said, the seat of your pants may be the sensor but the brain still makes the decisions, and if your brain's not comfortable, listen to it, not me.