I use Stellarmate with a Sky Watcher EQM-35 with EQMOD cable and it works great. However the mount chatters when slewing above 600X. I cannot set auto slew speed with Stellarmate. It auto slews to a target at 700x regardless of what speed I set in the INDI control panel. I can control manual slew speed on the mount control panel and the mount will slew at the selected speed with the directional push buttons.

I have updated the Stellarmate to latest version with the updater. I attached screen shot of the INDI control panel I am using to try and set slew rate. Is this the proper place to set it ? Is there something else I need to do ?

The Slew Rate dropdown is used to control the manual speeds when using the NSWE controls either directly or via a joystick. To set the GOTO speeds (when mount moves from one target to another via a GOTO command), you need to update the Custom Speeds control.

indilib.org/devices/telescopes/eqmod.html

Sorry to bump this old question. I have the same issue and that setting does not seem to work. GOTO speed is always the same (max). Am I the only one experiencing this?