I've just been using a Netro Spark to water my garden. I have set up 3 zones. Two of these zones have a rotor head sprinkler. However, they don't cover the same area. One of them rotates over 90 degrees. The other rotates 180 degrees. So I think the rotor head that covers the 180 degrees needs to run double the time of the 90 degree one. How can I set this? I've set the sqm for each head, but smart irrigation used the same times for both.