I'm not sure about these adjustments and how much they will help. Frankly, I doubt that moving the seat back will help and may even make it worse.
One thing I know, however, is that Ergon grips reduce my hand pain and I've got them on both my bikes. These grips distribute the load across the hands and I can go many more miles without shaking or moving my hands. I prefer the type without the bar ends, and use the bike's bar ends or buy some.
I love my Ergon grips!