HomeKit Brightness Slider produces steppy light fades via Sonoff Zigbee

I’m transitioning from Hue Bridges to a Sonoff Zigbee 3 Plus dongle. When I adjust the brightness slider in HomeKit, the hue lightbulb responds with steppy brightness changes. Previously via the Hue Hub it was smooth and buttery. Does anyone have any thoughts on what might be causing this?

Because I’m a noob, I completely missed this option. (Settings > Integrations > Zigbee > Configure) By default it is on 0, which makes the HomeKit slider really steppy. Change it to 1, and bingo, nice and smooth. Yay!