I have seen your post previously and have also tried that, probably followed every reasonable suggestion in the forum in over 40 include/exclude etc. attempts. I also have Z Stick Gen5 and also am only using the Switch1/2 channels, not the “legacy” ones. In an earlier releases I at least had a Flush 1 Relay working (but this only was because I used the legacy channel), now it doesn’t work anymore either. Part of the problem is regression related, I am pretty sure about that (bugs introduced in the context of code changes).
I think the problem is pretty much narrowed down to a problem with association groups in the context of multi channel association at this point. As a point in case, This is nicely visible in the channel settings of the device. Association group fields generally are all blank, and if I try to add the controller to Group 1 / Lifeline it vanishes again at some point. More importantly, NOTHING gets written to org.eclipse.smarthome.core.thing.Thing.json, even though this is what I set in Habmin:
(this setting will go away latest at next reboot)
You can check my org.eclipse.smarthome.core.thing.Thing.json here, the screenshot above corresponds to node 26:
I am afraid it’s not that simple, at least not in current snapshot 2.2.0. With no lifeline association with controller, updates are not going to work… 
@Chris will hopefully solve this at some point.