Dear EJ,

So your ELCs seem to be configured properly.
ELC Node 1 (Input A 0-0 and so on) is the same like Artnet Universe 0-3 in Catalyst (there, where "this Mac" stands behind)
ELC Node 2 (Input A 1-0) is on another Subnet and represents Artnet Universe 16 - 19 in Catalyst

Then everything should work without any trouble. As Mentioned before, please verify that the latest Firmware is on the Nodes loaded.

Best

Rolf