I use motors that are similarly rated to those, on an over-sized MendelMax with 10mm rods, which means an X axis that is a fair bit heavier than most. I run my Z axis motors in parallel, with a Vref of 0.4V, giving about 1A total current, or 0.5A per motor. For most machines this should give plenty of power to drive the Z axis. Have you calculated the steps/mm for the Z axis? Have you set a reasonable max speed and acceleration for the Z axis?
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