I just got my X-Carve 1000mm setup. I did a few cuts and all of them seem off on the X axis after a while.
I am using a 1/4" bit at speed setting 2 or 3 on the Dewalt. I cut in particle board, taking the MDF setting in easel but only half the depth-per-pass.
Reducing the default depth-per-pass to half has solved the issue a bit, but its still doing that.
I also have spun up the pots on the shield by one click each axis.