New Ford Mustang traction issue?

I recently purchased a 2015 Ford Mustang Ecoboost and have noticed ever since i purchased it (2 months ago) that the rear tires don t have that well of traction while turning. It has Hankook Ventus S1 Noble2 and the tread wear on it is minimal since its a new car. Even when I make a turn(going 15-20 mph, low rpm), it will feel like the whole back of my car slides/drifts into alignment with the car. Almost feels as if the road is slightly wet, even on a sunny day with dry streets. Today it rained and when i was driving I had to be even more cautious. I was driving down a straight shot with no cars around me and wanted to see how well my tires grip in the rain, so i accelerated to 3500/4000 rpm and my back tires started to spin out and the back of the car started shifting hard to the right with each press of the gas. Very scary and felt like there was no tread at all, but the tires are new. Ive bought new tires for my old VW(less powerful engine) and it never did that even when I floored it on a wet road, so I know it can t be the horsepower causing it. What can be the issue? Is this common with new tires or can they be defective? The tires look amazing and are very wide and look like they d grip well, but they dont… Any help or advice would be appreciated, thank you!
Added (1). On dry roads, I can floor it without this happening. Its not something that necessarily makes the car dangerous or scary to drive in normal conditions. I still LOVE driving it, just scared one day the rear might whip too much into a curb or another car.It only happens when making turns and driving on wet roads.

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