I have played with ML speakers for decades and a few things to keep in mind are: 1) They are line sources that radiate in both directions and 2) they are a capacitive load not a resistive load.
Others have mentioned room treatment. Because they are line sources, floor, ceiling and side walls are not a big problem, but the back wall needs to be treated. I think only having 1 ft behind the speakers is a big part of your issue. Mine are 6ft from the wall and I have a combination of absorption and diffusion to tame the back wall reflection. GIK was helpful in developing room treatments. I’d reach out to them.
The other thing that I have found is that most solid state amps are designed to drive resistive loads. I have tried many high end amps, but always found the best results with a high power tube amp and a solid state pre. A few years back I demo’d and then eventually purchased a SANDERS amp to drive the speakers. It is specifically designed to drive ESL capacitive loads. I then paired it with a tube pre.
Speakers are only one part of a good system. The room and amplification also need to matched to the job. They are tricky speakers to drive and to set up but they are sublime once you do. I also have large woofer towers to provide the bottom end.