Model Controller Assignement

[IndianaChristmas]

I'm creating a new display setup. 
I have defined two controllers and assigned them universe information as shown in the screen shot labeled "Network Setup".  You can see I have one controller (F16V3) with IP address: 192.168.10.10. It has  twenty-seven, 510 channel universes assigned to it.  A second controller (V48) with IP address: 192.168.10.20.  It has twelve, 510 channel universes assigned to it.

I have tried to set up my models using the two different controllers.  When I get to the selected roof line model, I set the start channel to #100:1 (the first universe assigned to my V48 controller).  However, when I open the "Node Layout" dialog box, I wasn't expecting to see the assigned controller to be the F16V3.  See second screen shot. 

What am I doing wrong?  I tried to give as much information with the provided screen shots showing my settings.

I apologize if my attachments are not labeled as I had hoped.

[IndianaChristmas]

I'm still looking at this issue and haven't found where I messed up.
If I change the start channel for my roof line to 100:2, the roof line will be assigned to the F48 controller.  Seems there is a channel count wrong by one.  Not sure how.
I set the absolute start channel for my roof line to the first channel of the F48.  The setup shows universe 100 is indeed also part of my F48 controller. Not sure why I have to set the channel to 100:2.