Acelab, I have the exact same issue. I have a helix floor, boss rc 300, and 2 Stagesource speakers.
The Stagesource speakers are connected via the L6 links, which I love b/c its so simple.
Looks like you figured out how to set everything up, and I'm stoked about the template to ensure the RC-300 is factored in all future patches, but did you ever figure out a way to update all the factory patches? Would hate to have to go in and add a new block to everyone.