Left Hook - any experienced boxers?

Hey guys. Rookie Boxer here with 1 year experience. How long did it take you to develop your left hook? This is the only one now I'm struggling with. Any tips? When I throw and sink, my left hip swings out a more than it should (feels like I'm exposing my liver). If I sink only a little bit, there isn't much power. Does this particular punch take a long time to develop?

The right overhand has got to be my most powerful punch. is this normal?

https://www.youtube.com/watch?v=vmAFFvdGc_o