check with your local pro shop about gettting it drilled. there are many ballls today that have a strong back end if the ball is drilled right. go to bowlingball.com and check out thier perfect scale rating system, it's very good.
Bowlingball.com along with several other sites are great information. I have worked with a lot of bowlers that complain their ball won't curve only to have me pick up the ball and curve it off the lane. I'm a medium speed, medium rev, senior stroker. It's all about the driver not the car. It takes commitment and practice to get used to throwing a ball in a direction away from where you want it to end up.