I couldn't watch all of it as I'm at work atm but a few things id try and focus on first.
You can't run unless you learn to walk properly - else you'll run like a tard.
When hitting the bag rap it with your knuckles first, then hit it with the flat(bottom) side of your fist. Do this per hand. So Knuckes/fist with the right - then knuckles/fist with the left.
If you're orthadox you'll find it's more tricky to hit the bag with your left, but it'll make your jab super fast and nothing feels better than landing a jab through a guard imo.
Do not worry about slipping anything. There is no point in doing it if the bag isn't swinging fast enough and if you can't take off from where you left off before the slip.
Take it slow, focus on getting the form right, with both hands, then increase the speed. Then once you get real good you don't have to rap with your knuckles, and you can mix up the pace, which hands you use and then add slipping.
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