The bike store fitter spent some time with me - at no charge - and we tried out several things and made the following changes:

1. swept back handlebars
2. 25 degree riser for front handlebars
3. Ergon cork hand grips. Unfortunately the multi position ones don't work with swept back bars.
4. slight uptilt of the seat so I don't slide forward onto it and shift more weight to hands.
5. practice engaging core