Please post the results of sending M122 and M98 P"config.g".

You're sure the motor phases are paired correctly?

https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors#Section_Identifying_the_stepper_motor_phases

Fairly straight forward if you have the details of your machine.

Post your results here for a check over.

https://configtool.reprapfirmware.org/Start

I understand, maybe I will continue with my motors since it’s actually not very bad. I’ll rather put this money on other tangible improvements.
Thank you very much for your time and for developing such a great board/firmware like the duet!

Many thanks
Luca