How to improve my form

[clemP]

Hi,

I play in France, and the community is pretty small, it's hard to find players with the eye analyst, so can you help me to improve my back hand ?
I'm a lefty player.
I throw at 300 feet, and sometimes a little more.

Thanks for you help !
Clement

Vidéo (2x real speed + 2x 50% slow)
https://youtu.be/rUKjJyuzqR0