you can see similar issues with very short wing span lifting body aircraft. Lots of stability issues in roll axis. Watching the college aero challenges where they have a class that uses very short span models to lift soccer balls. For sure these models have all had "interesting" handling qualities.
There was a "blimp" shaped heavier than air model from 1954 called the Martian Spaceship. It had the same sort of roll axis issues. A long but short vertical across the top helped reduce the oscillations.
View attachment 15834
Personally I think scale like speed would be what I would focus on rather than racing around. Then no real issue.
Got to say that blimp control does work well, it's like front wheel drive for your blimp. Well thought out and seems to do the trick well.