Have you fished that crab, Salty? I like it, truly I do. I hope I am not offending if I make an observation/suggestion.
I was wondering about the "proof of life" movement, or lack there of. Everybody has differing views on just what fish see, but subtle movement it always a plus, in my opinion.
I've watched crabs in tanks, in tidal pools, etc. The mouth never stops moving ... even when threatened, the part of the crab is still searching for food. Attaching a few fibers, in the mouth area, that will continue to wave when the crab is sitting still might make a difference between a "look" and a "take."