But in a standing vert, a long Achilles is better. Anyway, no need to talk about it because you can't change what you have, so... might as well continue working on that PC strength.
Is that a high or a low bar position? I can't tell from the video. It does look like the hips are really involved, though.
Actually a short Achilles is better for one leg jumping, because it takes less to load and snaps quicker => better ground contact times. A long Achilles is great for standing vertical jumps.
I have one too, I remember when I used to dunk with it, and felt so heavy, and was actually lighter than I am now. I think back then with a weight vest I was at ~92 kg, and now I'm ~95.