I am working on building a New Orleans Piano section of the site. The information will include what is covered in my new book, "How to Play New Orleans Piano", as well as other misc info I come up with along the way. The book has been released, and can be found in the "Bookstore" area of the site. Videos and lessons will be gradually uploaded and added over the coming months.
Enjoy!
Dom,
Sorry I didn't see this great question until just now!
Really, the answer is up to you. Whatever gives you the most comfort and fits your hand the best is the correct fingering. Seriously, simple as that.
My hands generally have 2 or 3 fingerings for everything they know how to do, and I unconsciously switch between them based on the context of what else is happening.
So, if you like the third finger when you're playing single notes, great. If you add notes and find that the third finger is no longer comfortable, try the 4th finger when you add notes.
Whatever gives you the most strength, stability, and energy efficiency is correct!