Thank you all - Yes, it's obvious to me now, I should have seen it. .5 produces a flat line response from stick to result. Expo (exponential?) changes produce curves to accelerate or decelerate the response to stick input and I see you can do it for sport and non-sport modes separately. Perfecto! Changing my sport mode left and right from.5 to .4 made a HUGE difference for me. Huge as it it smoothed out my flights in sport mode, no more big swings.
Interestingly, the physical hack of increasing the length of the joy sticks themselves was nice and I liked using it - but it has one undesirable result. IN order to repack my controller I have to lower the joysticks to their lowest level every time. This means I'll be putting pressure on the sticks twice each time I use them and have to remember to reset them each time and hopefully to the same place. I may have to cut a small groove in my case Styrofoam to handle this.
Gimble tilt smoothtrack: Ahha, this is another nice setting I'm surprised hasn't received more attention. Left at 0 when you tilt the gimble up and down and let go of the controller, it simply stops immediately. As you increase this number it adds a smoothness to this stopping. i.e., if you set it to 10, and til the gimble; when you let go it will slowly come to a halt. Smoothly instead of STOP. Frankly I think this should default to at least 3 so that there is always just a slight touch of smoothness to it's actions. Everything else is smoother, why not this one? I'm making changes to it and test flying right now.
