The ingredients can be adjusted according to your taste... add more simple syrup if you like them sweeter, more lime juice if you like them tart, etc. etc.. (overthehillandonaroll.com)
So, when you blend your next batch of frozen cocktails, add half an ounce to an ounce more simple syrup and lime juice than you think you need. (bonappetit.com)
Gradually add more simple syrup to reach desired sweetness. (asweetpeachef.com)