Could it be you are just used to hearing fat ported bass and the bass alignment in the Vandersteen with the passive radiator sounds comparatively lean? It's easy to find that fat sound appealing. It may also take some time to get used to the difference.
I can make large changes in my setup with a set of ASC tube traps. You might try experimenting.
I can make large changes in my setup with a set of ASC tube traps. You might try experimenting.