Agree on this... unless you're targeting sharks/tarpon, you're only going to spook away fish with line that thick. Also... never heard em referred to as "mole crabs" - always been "sand fleas" to me, and they make decent bait.
I've been beach fishing the Gulf coast of Florida for about 25 years. Caught everything from pinfish to 100 lb tarpon to 150lb+ sharks. The fun of it is you never really know what's passing by and hungry.
No idea if it's similar in Texas, but if you have a cast-net, catching pilchards/shiners/whatever you call em in Texas is usually the best option. Live shrimp is likely right up there too.
Again, depends on what you're targeting. Spanish mackerel (yummm) love the shiners, and a tarpon will swallow up a half of mackerel, so it's all relative.