If your smashed potatoes are not getting crispy, then try turning the heat up to medium/high heat.  The surrounding wind might be affecting the temperature of the griddle.  Use wind guards or move the griddle to a less windy area.  A trick to getting your smashed potatoes crispy is giving them time to cook without flipping them.  Smash the potatoes and let them cook for several minutes until they get crispy.  Then flip the smashed potatoes. Do not use a dome lid when cooking your smashed potatoes because the steam will keep the potatoes for crisping up!!