A cover ripping that fast is usually more about water balance and load than buying the wrong cover, if water was left too high or not supported the snow weight stresses the seam, I have avoided repeats by lowering water below the skimmer, keeping it clean with aquadoc pool closer winterizing kit, aquadoc algaecide, aquadoc phosphate remover, protecting vinyl with aquadoc stain and scale control, treating the cover with aquadoc cover protector, and making sure filters were cleaned with aquadoc pool filter cleaner before closing so nothing funky sits all winter.