Associate the LZW30-SNs with group 2. Note: There is a bug in the firmware that the switch states aren’t accurately reflected in HA (or ST/Hubitat/etc). I created an automation to change the state of the opposite switch when one changes. ie turning on the non-load will turn on the load even though the load is already on.
As @PJF said, set param 4 to 11 on the non-load. Param 4 on the load should be left at the default (15).