Getting mixed messages from Soundcraft.
My setup is just the FOH board and Stagebox 32. I got a 150' cable that seems to match the specs you show above, but I've been getting clicks similar to word clock issues. I messaged Elliot from SC through Facebook, and this is an excerpt of his response to me:
I've been trying to find a F/UTP (foil outer shield) Cat 5e cable with solid core but having a hard time locating any in North America, let alone Canada.
BTW, their own cable sells for $1275/100m (328') roll on fullcompass.com. No, thank you.
I don't work for Soundcraft, but this is based on my experiences touring with a Vi6 for a number of years (since ver 1).
The clicks indicate that the console and the stage box are not properly syncing to each other. It is caused by the cable having a capacitance that falls outside the acceptable tolerance for the Madi cards.
If you are in Canada, try SF Marketing in Montreal. We used their (Digiflex tactical cat5 if I recall correctly) sheilded cat5 cable for a 300ft Vi6 snake. I can't recall if it was solid core.
What we found with the Vi6 is that the Madi over cat5 is very picky about the cable. Certain brands work and others cause the clicking you are hearing.
If there is a sound company near you try a length of whatever they are using and see if it works.