How do I keep my big wide spiral curls

Hi,I'm wondering if you wonderful curly ladies could help me.I have big wide corkscrew curls...(My mother used to call them Banana Curls, growing up)  When I first get out of the shower, and the first day, they stay sort of intact, but usually break up into smaller curls as the day goes on.I'm wondering how I can keep them big and wide.....I basically have hair like Bay on the show Switched at birth.  To give you a visual.  :)Any help???  Thanks!

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