I have had similar experiences with my Maggie 3.6r's. I tried a big McIntosh (501's), some big tubes (Antique Sound Labs Hurricanes), Parasound JC-1's (great) some Krell's and Brystons, but always I came back to the realization that you need LOTS of power. I'm not sure that the Accuphase would give you much in the way of dynamcics.
My experience is that the speakers really changed and woke up with the Innersound ESL 300, then got better with the Spectron Musician III, then the BelCanto e.One Reference (not as good as the Spectron, but good), now I have settled on the Cary Audio MB500's. As ISanchez says, a good power amp will take hold of the bass. The Cary's have been amazing, really a revelation to me. The just throttle the Maggies, they are never out of control and my Velodyne SMS-1 has measured the extension down to 32hz, and set the crossover at 45hz, it sounds great.
Since you are in Italy, I would suggest some big Electrocompiant's or the big Musical Fidelity amps (I have heard they are a great match).
Where are you in Italy?? Exactly a year ago today, I visited Florence (Firenze) for the first time. WOW, amazing, we loved it, in fact stayed 2 extra days there and cut out a trip to Milan.
Good luck.