Welcome to OFF. Glad to have ya.
Those Gulp! Worms / Nightcrawlers work way better than the real things do! In fact, they are so much better that I don't even buy any real ones anymore.
The Gulp! worms stay on a LOT longer. So, they'll often catch multiple fish...without even re-rigging a new one. I bought a jar about 2 or 3 years ago. And, I still haven't used them all up. So, I have saved a TON of money too (versus buying dozen's of the real mccoys).
I don't know if they float or not. But, they work very well when trolling...either alone...or on a Wedding Ring, etc.
BTW, do you thread them on head first or tail first?
The famous local guide, Buzz Ramsey, threads worms on tail first. He says that a fish will go for the head. So, you need the head on the hook, and the tail up the hook or line. Try this tip, and I'm sure your catch rate will go up.
Best of luck.