How do I prevent my aero covers from slipping up like this? Are they too small or too large?

First time using aero shoe covers and although I love how clean they keep my shoes, I do notice that the heel keeps slipping upward like this, regardless of how I position the front or how high I pull the sock portion. It’ll stay on until I start riding then it’ll slip up, probably because of the way I toe down a bit when I ride. The sock portion is already hella tight if I’m wearing socks and tights so I don’t feel that the covers are too small, but I feel that if I go larger, this problem would happen even more easily. Should I just try a different brand?