I think I need a second hub so I'm going to split my z-wave and zigbee devices. I plan to stack them but does the stick I have on my c-5 the z-wave radio only?
Yes.
You can get a c7 which has both inside and doesnt require an external stick and use hub mesh to join them. That said, why do you want to seperate your zigbee and z-wave to seperate hubs?
I have 30 z-wave devices & 50 zigbee devices, influxdb, home bridge, schedules, etc. All these messages flying around and I'm seeing issues on z-wave where set points are being missed and duplicate messages
how much of your z-wave stuff is paired at s0? I'm about equal to you on devices though i don't use homebridge. If a lot of stuff is paired at s0 I would re-pair them without security (same for anything s2 except for locks). S0 is extremely chatty and it may help your situation. (just an idea)
I use no security on my z-wave for that reason and I've also had to rethink energy monitoring on my devices too. Binned 4 of my cheaper z-wave plugs are I had to control on how they reported