My last overnight soak only yielded about a hundred shrimp. I went to smoke half of them and discovered about 10 of them were very mushy/grainy and basically crumbled in my hands. I always purge mine overboard in a big nylon laundry bag..then pop the heads and right on the ice. It's common to have a couple duds but 20% seems high to me. Anyone else notice this or did I just get unlucky?