Dan is probably the best person to ask about this, but I assume the interval_program limits the number of stations to 32. It should be easy to increase this number to anything, I am just not sure if it’s a matter of changing one macro define, or there are multiple places that need to be changed.
Regarding your wiring experiment, I think it’s important to keep the resistance of the wires low — it helps to use thicker wires, or combine multiple wires as you did.