IMO a typical speaker like some you have mentioned above will not offer the same sound of a horn based speaker. They usually cannot provide the open sound as horns. While horns usually do not have the bass to keep up with the rest of the speaker. I find it hard that you are not getting musically and dynamics form your speakers. To me that would be a component issue. I am not familiar with the Pass amp and what it can do so I cannot help you there. I have only owned the Pass X-250 a long time ago which is a completely different animal. The speakers you mention above cover a wide range of signature sounds. The Magico and the Vandersteen are completely different sounds. I own 5As and my buddy had a few of the Magico speakers. They don't offer the same sonic signature both very different approach. I would take the time to hear what you can before making such a change IMO.
Happy Listening.
Happy Listening.