Wet Spots/Dry Spots - Irrigation System

You have an irrigation system right? You notice some really wet spots and some really dry spots. First check coverage and make sure its head to head (meaning on sprinkler head to another) then ask yourself this? Are there variations in sun exposure in that area? If so think about a Smart Controller that allows you to program in shade/sun, soil, plant type, etc. to help with less over watering and watering more efficiently overall.