I don't think anyone can realistically give you span and pitch recommendations without being able to physically seeing your fit and examining your hand. With that said, an incorrect grip, span and fit can definitely cause you pain. You need to find the best pro shop in your area and work with them on your fit. Explain to them the pain you are having and they should also check the flexibility in your hand and fingers.
I wouldn't worry about your roll until after you get the proper fit and are pain free. That's the most important thing.
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