I was actually thinking about this the other day, being about 20K away from being entirely done with Cooking, and given Urat's Apron testing I thought the following would be optimal for me...
Waders > SSR (depending on Ebisu progress) > Signboard > Apron > Fishing Hole Map (Assuming you don't buy 'The Big One' once you obtain your signboard) > Everything Else.
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