This is a very specific and honestly small suggestion.
But one of the loot tables for the sunken chests include azure quill floats and dusky spoons. And it will be those every single time you get that chest. And after getting that chest multiple times, you'll soon have a stack of both in your tackle box while the others are rather lacking.
My suggestion is that for those two items in particular from sunken chest, can give the other varieties of those items.
For example, instead of only getting the dusky spoons, it could either be sunrise, dusky or nightflyer spoons. And for the azure quill float, it could be either black, crimson, saffron, or azure quill floats.
That way it can have slightly more variety in the floats/lures you get from that chest and make it so your tackle box is not filled with only azure quill floats and dusky spoons.