Temporarily Unpinning Feet?

Howdy! I have a character that I'm trying to make jump. When she jumps, I want her feet temporarily unpinned to the floor so I can make her legs straighten out and her toes point. I've tried making her legs swap sets, so one set is "ungrounded" and one set is normal, but I'm still getting some weird distortion on her legs.

For reference, here is how her legs look normally + how they're rigged up (both legs are rigged the same but with opposite L/R tags).

And here's how they look when I try to make her jump, + how I tried to rig the jumping leg so it wouldn't be pinned to the ground.

Thanks again for any help y'all can offer! 🙂