The question is how many revs you want and different styles of bowling can affect that. You want square shoulders throughout the approach, it will give you more accuracy, but less revs. Opening shoulders allows you to wheel the ball, but takes much longer to get consistent. Also what I think has become more popular in the high rev age is the bent elbow "loading" where you need to load your arm on the downswing and roll the ball off like a yoyo. Very hard to learn and requires more muscle than just straightarming the whole swing, but gets you much more revs and many pros do it cleanly and consistently.
I would say, figure out what style you want, and get a video camera and film yourself bowling. That has helped me the most getting my form back and increasing revs significantly is by looking at myself and changing what I dont like to see. Consistency comes with time, form comes with development, and YOU HAVE TO DEVELOP YOUR FORM FIRST, because you dont want to consistently do the wrong thing.