I have asked my pro shop operator but he says I should just play down the 2nd arrow. He said I need complex wrist positions to play inside out.
first of all, Coach Jim is always on the money.
Notwithstanding his very good advice, I use 10 releases, one of which is what Coach Jim preaches. The one you describe, I call the "Planetary Rotation" because it looks like the Earth spinning on its axis.
That particular rotation is useful on lanes that are dried and fried. I throw it down and in, throwing at the first arrow and more or less directly towards the 3 pin. The rotation changes in the last 10 feet into a forward roll, with a perfect angle to the pocket.
However, this rotation is of limited use. I would recommend you learn a release from your local coach that will not require muscles, like a ladies' shot. If you notice on women's bowling, they don't cup their wrist, but they still get power at the pocket. My wife throws limp-wristed and gets 3 or 4 strikes per game.
If you opt for the firm/cupped/c0cked wrist type of release taught by Slowinski, then I recommend 5 to 10 pound Kettlebells (you can google that). They are better than dumbells for wrist curls, imho.