I would imagine it went to shit. It's the square edges that make a snow/ice tire good. Once the edges are rounded the tires grip is greatly reduced.
Also keep in mind that the XL load rating is not universal. It's simply a heavier load vs the Standard Load version of the tire.
The OP's tires really look like the load rating, even though XL, is not correct and on the light side. Finding a tire with more capacity would probably be a good option.
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