If the bass is not to your liking it won't matter what others think. Yes, a sealed bass system will require more drive from the amp to create the dynamic impact you seem to want.
The Magico is not a very efficient speaker, and there is a world of difference in performance in terms of dynamics in speakers. The Vapor Audio Nimbus White I have reviewed for Dagogo.com (not yet published) is 93dB efficiency and 8 Ohms, which is an entirely different ball game in terms of dynamics, especially since it has a 15" bass driver.
It sounds like you selected a speaker based on "pedigree" and expected unlimited performance; that can result in disappointment. But, one learns and moves toward a sound that is thrilling to the ear. It often takes several tries over the years to obtain a combination which is to one's liking.
What Thesoundhouse said is correct; there would be no major mismatch with the Pass amp and Magico, and many would find it lovely. However, it seems you are after a different set of criteria for what is for you good sound. That may take some searching to obtain.
Finally, "just fine," while can be interpreted variously, shows you want a wow experience and this set of gear is not producing it. I believe that shifting to a more powerful amp will not get you to the place you want to go in terms of listening, but that instead you should change speakers. This is no slight to either amp or speakers, but more an attempt to capture what you expect from your system's sound. It seems you want much bigger, fuller bass and more dynamic impact. To get that you would be best served to work with a more efficient speaker (Mind you, not a high efficiency speaker run by lower power, per se, but more efficient).
This situation is a good example of how lovely gear does not always give the listener/owner what they want. Sometimes it takes more searching than we would expect in order to capture what is excellent sound. There is a huge variance in experience/sound quality between systems.
