k only watched 39 seconds but here's what I saw.

Tuck your goddam chin!
Pull your punches back straight instead of letting them pull back in a U shape.

Mostly I agree with Chris.
Have your focus mit partner throw back at you, jabs/hooks etc so you don't get sloppy.
Also work on changing pace. Ok so I ain't watched it all but vary your speed. Fast jab, slow jab Hard right. Paw the jab then throw it fast. Do this for all your combinations, if everything is one pace it's easier for your partner/fighter to get in to your rhythm, if you mix it up they can't read you so well.

Good luck