If you love them now, don't change anything, maybe begin to save up for a similar product that is larger, as others have said. If you think they need to do better, i agree with trying different amps. From my own experience, it is not the price of the amp that is the deciding factor, but the amount of damping and/or some other synergy that is hard to define. I found the SMSL DA-9 to do better than expected! Not saying you should buy one, but if you can borrow one, try it, don't be afraid to try any inexpensive Class-D amp that you can borrow. They may have better control over the bass, and the diffuse imaging of the LRS could maybe hide the other flaws the amp may have!
This is a true story, at least in my house, haha!