Well I've used a lot of soft plastic crayfish in my time. Some were ultra-realistic models of the real thing. Others did not necessarily look realistic, but had thin worm bodies bulging out with exaggerated claws and antennaes far bigger than any living craw. Regardless of whether they were ultra-realistic or not, they all caught well for me in their time. Anyway, I keep trying different stuff as far as fishing goes.
Manufacturers are good like that.
Well, take a look at a real craw that croaks in your bait bucket. The wide fan tail folds in on itself, bends and folds under the mid-section. The legs and claws fold in on themselves too. And that's what you should attempt to imitate with Texas-rigged craw lures. Another point is the compact size of the following lures.