It would be a lot easier without the speed changes. From what I can see, most of your problems come from 2 things - lack of knee bend, and trying really hard to hook the ball.
You have a great hand position - you really don't need to rip through it like that. Try keeping your arm straight and letting the ball roll off your hand. You'll be surprised how much reaction you get.
As far as knee bend, you are basically finishing in a standing pose. Get your left knee bent when you slide, and sit your hips and butt low. It should be like sitting in a chair - hips back, chest fairly upright. Make sure your trail leg moves out of the way of the ball, get that deep knee bend, and let the ball roll off your hand, and you will see yourself get a *lot* more strikes.
I see you're a 153 average, so working on your spare game would probably help your average the most, but working on the things above should help you leave less spares, and easier ones.
To answer your question about bad shots striking, that is typical of a house oil pattern. Not sure how much you know about this, so I'll go basic - you probably know there is oil on the lanes. It only goes down part way, about 2/3 of way to the pins. There is a bunch of oil in the middle, and less towards the gutter, so if you miss inside, the ball slides into the pocket, and if you miss outside, the ball hooks earlier and gets back to the pocket. Harder oil patterns won't give you that luxury.
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That my boy... that's pro quality.