Well, I managed to time it just right finally and get through right at 8am. I only waited about 2 minutes, but the very kind cast member told me there wasn't anything she could do about excursions and encouraged me to just keep checking availability and if that doesn't work to go straight to the desk when I get on the ship. She said there was not a waitlist.
Disappointed since it seems like other callers that got through had some success, but maybe with all the wait they have limited what they can handle. At least I got through!
We sail on May 30th.