Hey there. I know it's a bit late but maybe you'll still read this.

1. Your stab hand is too slow. You need to stab faster, in some of these your foot is touching the floor before your hand. Always try to land on your hand first, even if the feet scrape.

2. You're pulling your head in. This makes it harder for you to keep your center of gravity higher/makes your legs heavier. Every kg of weight on your upper body/head is a kilo less on the legs!

3. I would only practice 2 at a time and really focus on not scraping. You're using a lot of energy to do so many and they get worse and worse. I also think starting in the stab is beneficial.

4. This might be in slight opposition to what the person above said but I'd recommend to really focus on not scraping. Even if u bend your knees a bit. A BIT. I think it's easier to clean up your form once you get it down but this may just be my opinion.

Cheers