The best thing I ever did for fixing my release was bowling on the Shark pattern and having it kick my azz up and down all the way to a 110 game. Realizing I was throwing the ball like garbage, I had my ball driller/coach watch me throw a few balls to figure out what I was doing wrong (turns out I was coming around it too much and getting inconsistent with my release).
To fix it, I tried to roll the ball perfectly straight up the 10 board -- I didn't care where it finished after it hooked, I just wanted to roll the ball in a straight line and come out of it clean. To help do this, I also focused on taking a lot out of my release and starting with my hand in a more relaxed position and finishing in just a handshake position.
I gradually worked on increase my revs while maintaining this type of release, and my accuracy improved greatly, and my ball reaction magically changed. I was able to get the ball to read the pattern better, hook more consistently, and carry better since I was getting more forward roll on the ball instead of relying so much on axis rotation. I shot a 200 the next game (which I was only able to do one more time on the Shark because I never could kick out a 10 pin once the carrydown hit on that pattern

), and felt a lot more comfortable. Within a month or so, I shot my first sanctioned 300 game.
A couple weeks ago when I started to slump a little (shot a couple 580s on my Saturday league where the shot gets pretty tough, but not THAT tough), I figured it was less me just making mistakes occasionally and more me getting my basics out of whack, which results in mistakes being very frequent even if I don't notice it. So, I went back and did this in practice, and immediately felt more comfortable and shot a 280 the first game the next night when I subbed on someone's team.
Getting back to basics is the best way to start to improve your release.
And also don't be afraid to try different parts of the lane to find a better ball reaction. If you have a fairly generic wet/dry house shot, you should be able to move your breakpoint out closer to the gutter (depending on the surface of the lane and the amount of oil, not to mention your release and your ball, this could be anywhere from the 8 board to the 4 or even 3 board). Find the friction, then move your feet to get the ball to that friction at the right time so that it gets the ball back to the pocket with a good angle of entry.