You have the specifications of the motors supplied by RepRapPro wrong. See [www.aliexpress.com] for the correct spec. This motor [www.omc-stepperonline.com] is a close match.
For the Duet (as with most other 3D printer electronics), you should choose motors with rated currents in the range 1.3 to 1.7A.
For the Duet (as with most other 3D printer electronics), you should choose motors with rated currents in the range 1.3 to 1.7A.