Some things stood out to me. The most obvious is as it was mentioned, your swing is very muscled. I think that is compounded by a few things. Your span and pitches may be a little tweaked. It's hard for newer bowlers to get used to the pitches they have. Most get their ball drilled without having a fitted thumbhole ever so when their thumb swells they open the thumbhole. Then thumbhole gets too big and the ball starts to come off early and hello Death Grip. If you don't trust your driller than find a new driller. Make sure they have all the right certifications and if possible use the Dual-Angle techniques. Basically, if the ball doesn't fit right, you're doing yourself more harm than good. I don't care what anybody says, bowling is a feel sport. If the balls doesn't feel right you shouldn't be rolling it.
Your swing also is so muscled because you are charging the line as well. Where's the fire mate? Rhino Page doesn't even get to the line that fast and he got his nickname for charging the line.
You may want to slow down a bit and work on getting your feet and swing more on the same page so that you can straighten out that elbow and get a more solid and stable finish position. You may even want to consider a 5 or 6 step approach if you like the current speed of your footwork. That way you can start the ball a little earlier and keep everything in time.
Additionally, you'll have to doe some work on your release because it looks to me that you are coming over the top of the ball a bit. It creates a lot of side rotation and a late break however, that could be the culprit for why you can't get your ball to hook. You're losing a majority of your leverage and the ball isn't reading and reacting right because of it. Ideally, you want to stay behind the ball with a cupped and/or cocked wrist and on the downswing start to work the inside of the ball and get the thumb out of your ball as it passes your ankle on your slide foot and torque it with your fingers the rest of the way.
Next, this is kind of a two in one thing. Work on getting low with your legs. You don't have a ton of knee bend in your slide. Additionally, you pop up at the line. Getting low with your legs instead of bending over at the waist (which isn't bad mind you, a little bend at the waist is fine), will generate more power, leverage and momentum that can more easily be transferred to the ball. As an added bonus, it will dramatically improve your finish position which will also help your accuracy, timing and release. Also if you keep your head in the same plane while moving towards the line it is far easier to hit your mark than not. Less involutary adjusting for the brain and body to do. It's a bit tough to do sometimes but like all things it takes practice.
Last but not least, your arms. Personally, I don't like seeing the swing arm over in front of the body. It makes it far too easy for the pushaway to stray out to the right or left, which pushes the ball out of its swing plane/slot (which leads to inconsistencies and muscling to try and correct it). I'd say bring your swing arm over a touch so that your arm is in line with itself and then line up with that arm (shoulder to ball) with your target line and have a go. Next, try to get as much weight of the ball in your non-swing arm. It'll reduce the tension in your swing arm which can only help. Less muscle=more accuracy, less fatigue, less inconsistencies in your approach in more cases than not. And use that balance arm. Don't throw it out there limpy, use that sucker to counter the swing motion. It's a very important part of the swing, like the trail leg, that gets overlooked as frivolous. I'm not saying they're bad but it could help to use them a little more.
Now to finish, like a new bowler with a new ball, you get new ball syndrome and have to have an arsenal of the best balls as soon as possible. DON'T DO THAT WITH FIXING OR IMPROVING YOUR SWING.
Unless you're a prodigy, it is very hard to work in new techniques or work out bad habits quickly. Usually they have to be done one at a time on a consistent basis. Some of them you can or have to do together, like the footwork and swing syncing, but again it takes practice practice practice. So first make sure your fit is alright and if need be learn how to tape up your fingers, and thumb to create the right feel for you if you don't already. You wouldn't believe how many bowlers are held back by an ill-fitted ball (one talking to you right now, need my spans adjusted a touch). And then proceed through the rest of the list as you see fit, and perhaps enlist the help of a coach. Experience and an extra set of eyes never hurt anyone.
Hope this helps,
The Demolition Man
Also you want to try and shot a video when it's lighter at the alley and with a couple shots from behind and a few from your swing side.