No, I'm not repeating what you said. Mike Ball's Spoilsport is *the* premier GBR liveaboard, and has been since the 1990's. If you couldn't find Spoilsport in 2019, you weren't looking very hard!!
You also implied that they run short trips of 3-4 days, and you can do 2 or more together. When actually, the trips are usually 7-8 days, and run from Cairns up north to Lizard Island and back. For the "short" trips you essentially cut the itenary in half by either starting or ending the trip at Lizard Island.
You should probably also mention that it's a 5-hr drive from Cairns to Alva Beach where the Yongala is.
It's great that you want to help out with what you know, but don't state your incomplete knowledge/awareness as fact when it isn't.