Firmware 1.52 on both switches.
They dim at different speeds when dimmed from one of the two physical switches. For example, I turn them both on via one switch (this now works great thanks!), and then I start to dim them from that switch, the further away switch dims at a faster rate so that light ends up being dimmer.
Not really a big issue at all, because we set the default local dim on all switches based on sunset/time of day. More of just a nice to have.
Going on the settings here: Dimming Speed and Ramp Rate (Parameter1 and Parameter3) are swapped - FIXED IN 2020-08-12 DRIVER - #3 by mamber
I have all the lights in my house set to:
Param1 = 1 (fast on/off via zwave command)
Param2 = 3 (regular fading when dimming via paddle switch)
Param3 = 3 (regular fading when dimming via zwave command)
Param4 = 1 (fast on/off via paddle switch)
And between both switches I have Association back and forth for:
2: Basic_Set
4: Switch_MultiLevel_Start/Stop