@yuhengdu_tiger I think you are fighting two battles at once: room acoustics and speakers.
No matter what speakers you choose, your room size and placement constraints close to boundaries create issues in terms of room modes and resonances. Serious acoustic treatment will be worth every penny, starting with bass traps in all corners and acoustic panels on the front wall. Also much cheaper than new equipment!
On speakers, I have 2 more suggestions. The first is the Living Voice Auditorium series. These are really excellent, deeply musical speakers, which still have a compact footprint similar to the SCM40s, but far higher sensitivity so much easier to drive, and have a strong synergy with tube amps. Though they are also not EDM bass monsters, they have higher cone surface area from the dual woofers for lower frequencies, and fantastically integrated mids and highs. They are absolutely worth adding to your shortlist.
The second is the SCM19A tower version. Same footprint as SCM40, all the benefits of ATC active biamping, and the new ATC tweeter. Going active should result in better dynamics, detail and bass authority than the SCM40 passive, even foregoing the separate mid driver. Note that the SCM19/20 has the SL midbass with the mid dome grafted onto the cone. Nobody argues that the SCM19 is preferable to the SCM50, but many users have found they preferred the SMC19 to the SCM40. They both share the same basic sound signature, but some find the 19/20s drivers sound more integrated. This was actually my experience when I demoed the passive v1s.
