without seeing you bowl its hard to say but it doesn't sound like the ball is the problem. if the ball reacts one way one throw and reacts completely different another throw I'm sorry to say but its you and not the ball.
also why are you SCREAMING AND YELLING? typing in all capitals is considered RUDE and is interpreted as someone screaming and yelling. you're better off typing in all lower case if you're lazy about utilizing your shift key. you wont get many people to respond if you keep typing like that.
