I have concerns about fiddling with the hardware. That´s also why I asked about people´s opinions here.
What I take from the answers so far is that amp choice comes first. That seems to have the most significant impact in shaping the sound. Once I´m happy with an amp-speaker-combination and still find the speakers lacking, I may give modding a try.
Thanks for the suggestions which amp to try / which one is best. I heard about the Enleum 23R and find the concept striking. It just may be too analytical for my taste (on top of being just a bit too far out of even my inofficial price range) (but ask me about that again after I decide on something). I don´t have tons of hifi experience and was happy for a long time with my Audio Physic Yara II speakers, but the Cornwalls have shown me how much more music can breathe played on the right gear. I heard new things, which is amazing. And I´m sure pushing the lower frequencies a bit (or whatever the magic tubes can do is called) will make them even better to my ears.