I agree with what Scott said bowling form is really important for consistancy and something I find myself always working on in my own game. This video will show you some of the things you can pick up from the Pro's. It actually helped me when I got back into bowling to get my arm swing in line with my head and close to my slide foot like Scott said its a world of diffrence. When you wing your arm out your prone to alot of issues with accuracy IMO. Other wise most of what your doing seems to be working we all have a bit of diffrent style to our throws good luck..
http://www.youtube.com/watch?v=N5nnDbV0 ... detailpage