The information you're getting from SPAL is pretty interesting, and not in a good way. It's not better to have the fans running all the time. They should cycle on and off as needed, and they shouldn't be on at all when you're maintaining a constant speed that's much faster than 30 mph. The radiator should be able to handle that without the fans in most conditions.
To me, if the fans are running all the time it either means the radiator is too small or the fans don't put out enough CFM. You should be able to have the fans kick on at 200, cool the car down to 185, then shut off. If you're cruising, they should be able to stay off and the radiator do the work. The whole point of the electric fans is that they aren't running all the time, you're not wasting power driving a fan that you don't need. You should be able to set them to maintain the operating temperature you want, so the car stays in that range.
