Group of GE Link Bulbs Light Show: they won't turn off at the same time

Hi all, I apologize in advance if this has been solved somewhere else. I have a vertical grow wall and I am using 8 GE Link Par 30 bulbs as grow lights (works great!). I have set up routines to turn them on and off morning and night. I have also used Dim With Me to get the lights to dim down evenly in the evening.

Oddly, when I turn the lights off, both via routines and a Lutron Connected Bulb Remote, the lights all turn off at different rates (exit ambiance). Is there a way to get the lights to turn off in sync? I tried using Smart Lighting and Dim With Me to fix it and got the same results. Thoughts?