MKS DLC32 Max with DM542T v4 drivers

[Aepx]

First time using a grbl board with external drivers and I'm not having any luck.
I have the drivers connected to the external pins on the controller as follows:
S -- PUL+
D -- DIR+
E -- En+
G -- All 3 grounds for the above

The drivers are set to 5v.
The motors do work but I'm not getting enough torque to move the X or Y axes.
Also, no holding torque at all even though I have $1 set to 255. (BTW, what's the difference between $1=255 and the setting to enable all axes always? (maybe $17? I forget and am not connected right now)

Is there any known issues with the MKS DLC32 Max that would cause this?

[terjeio]

You will have to ask MKS support if the outputs are 3.3V or 5V, if 3.3V it is likely too low.

BTW it is common to connect the positive pins to the supply and the negative to the step/dir/enable outputs. If the outputs are 3.3V do not do that or you may kill the MCU if the supply is > 4V. See the driver documentation. ENA is often left unconnected.