I would never try to fit someone without seeing their hand, but I will share my experience with you. A few years back I had identical spans to you with 3/8 reverse and 0 left/right. After having to squeeze the ball for years, I dropped to 4 11/16 and 4 3/4 with 0 for/rev 0 left/right. This eliminated my squeezing and has softened my release tremendously. Again this is just my experience so take it for what it's worth. If you have access to a jayhawk fitting ball with movable spans and pitches just tinker with it until you find something that feels good.