Hogio: I have no experience with the speakers you bought, and don't know anything about how difficult they are in the bass with tubes. However, I have owned both the CJ MV55 and VTL MB-185 amps. As you would expect, the more powerful monoblock VTLs reveal more detail and have more bass control. But if your room isn't large, the little MV55 can be a very nice sounding amp. To me the first thing you should do is live with the combination you have for a while, both until the speakers are broken in and until you have experimented with speaker positioning and gotten acclimated to their sound in your room with your current amp. I'd say give at least 1-2 months before making any new moves about amps. Also, if your MV55 is fitted with the stock Sovtek tubes and/or they could use replacement now, I would recommend using SED EL34 output tubes, Shuguang 6SN7 driver tubes, and EI 12AX7 input tubes (matched and selected for low noise/microphonics), unless you use NOS. In any case, don't expect what you heard of the bass at your dealer's to necessarily translate directly to what you'll hear in your own room -- bass response is too influenced by the room and speaker setup (and even speaker cables) to under different circumstances simply assign various characteristics to partnering amps or tube types in isolation. Enjoy your new speakers!