In the suggested setup, for every "ringing" line I programmed several phones, not just one. E.g.:
"Night 1" (Service Mode 1)
Line 1: #27, #28 (Control Set), #28, #30, #34, #39, #40, #41
Line 2: #43 (Voicemail by Feature 985)
Line 3: #43
Line 4: #43
I'm going going to test it today.