People with small hands tend to favor Campagnolo, and to a lesser extent SRAM, over Shimano.
Shimano also has an Ultegra grade short-reach shifter set designated R700. The current WSD Madones spec the regular shifters.
Handlebars and lever position also play into your ability to reach the levers. If you'll be working with a fitter to choose and build your new bike, that'll be something to work out.