You can only get an exact percentage that matches 80/20 split in multiples of 5 items. One way of making that happen for as few items as possible is to create a repeating schedule like this:
The reason you have 3 types is that Station7 and 19 are relabelling items from a uniform distribution:
Changed model attached.
Your Station19 and Station7 objects have an On Process Finish trigger that sets the item's Type label to a random number 1-3.
So any items that go to those stations have their type overridden as a random value uniformly distributed between 1 and 3.
Remove those Set Label triggers to fix your problem.
Type a product name
