I often use butters and horse clams; extras get frozen for later use. I wouldn't go through the pain of digging if they didn't produce. Just be sure your bait holder prevents the crab from stripping that soft bait; maybe add something with a bit more substance to keep them interested.
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)