That itch is tough to ignore. Sometimes the newer system winds up being worse!
Speakers like that are very expensive to make and the market for them is limited. There is certainly a point of diminishing returns and you are well past it. Once you are use to that amount of bass power it is hard to revert to something smaller. You might try working with them, not just changing amps or other electronics. The two most difficult parts of speaker design are the enclosures, which I seriously doubt you want to mess with and the crossovers which you can easily play with, for fun! You might just surprise yourself. DEQX is recruiting 120 audiophiles to beta test the programming of their new processor, the Pre 8. It has a programmable 4 way digital crossover in it. Retail in the US is going to be $13K but they are giving them to the beta testers for $6K. Cheap entertainment! I do not think they have yet reached 120. Have a look at it. https://www.deqx.com/