I have an Induro C413 I use for portrait work, but I prefer not using a center column for landscape work and Induro didn't (and maybe still doesn't?) have that option. I use the Arca swiss cube and attached to the Gitzo 3541 XL it just seems more stable. I use the RRS BH-55 on the Induro, and it's a nice combination for portrait work where I do use the center column to adjust camera angle.
That being said, the center column locks very securely on the Induro and even though that might raise the center of gravity and technically be less stable, it isn't bad either. I've used the cube on it and it's performed well, but I've never actually done any testing to verify the gitzo actually is more stable. It's more a matter of best practices .. with the p65 back you just have to do everything you possibly can to ensure good captures, because it quickly reveals any and all flaws in your technique. everyone says don't use a center column and many of them are much better and more knowledgeable than I am.