If you don't need the extra high DIN of the Duke, you may as well save the money and weight and go for the Baron. Both have a max DIN way higher than what you ski (13 for the Baron, knee-shattering 16 for the Duke), and both are best in the role of mostly inbounds with the occasional tour, as you describe. While they don't tour as well as your Fritschis, they will ski downhill better with significantly less rise and a more natural ski flex (for all intents and purposes as good as a normal alpine binding, with full alpine release as well).

There's also the new Marker F12 and F10 Tour bindings which supposedly offer downhill nearly on par with the Baron/Duke while offering better touring, but they're somewhat new and I haven't tried either yet.