I'll just mention a couple of things that I noticed. In the beginning of your heavy bag session, it's like you're shaking your left hand before you jab. Against a boxer this would prompt him to counter jab, or come in quick with a right hand. You don't want to tip off your punches. Your left hand should be held steady, yet relaxed when you punch. Don't lean forward. Your elbows should be touching your body when you're not punching. This protects your body, as well as being the best launching pad for your punches. The hooks need work, and that requires some one-on-one instruction with a good trainer as it's inadequate to learn correct technique online. They'll also be able to help you with your posture, how to stand properly, and how to move.

On the double end bag, the set up is causing the bag to move around erratically. Ideally, the bag should go back and forth thus simulating a punch. I think it's the shorter cord on top that's causing it to move funny. I'd see about putting it outside, with the top cord being longer to give it much better movement.