Did I miss whether it was awd or fwd. If it’s fwd, adding weight to the back makes it worse. The tires as every one has said are the first thing I would change. Cooper makes a variety of models. You need to scope out reviews of your and others tires and look for those with better winter traction then you have. You really can’t make general statements of how good in snow all season tires are unless you know both the brand and model. They differ. Some are really poor, some are acceptable in moderate conditions and none are as good in severe conditions as dedicated winter tires with the snow flake emblem.