Unsound - The wavy drivers are very exciting, and depending on how the future unfolds, I hope to work with them.
Regarding the CS5s, I doubt whether I can help the low impedance, which is baked in with those drivers. A dual input option would sequester the severe bass load to the woofer amp, to free the upper amp. But as you know, that solution requires additional amp investment. What I can address is the two bucket brigade delays for the two midrange drivers which insert 36 components in series with them. That delay can be directly achieved with physical driver offset by re-working the baffle. A veil will be lifted. Given more time in 1989, that 3-D baffle was my preferred solution. As a historical note, I would have expected a CS5.2 after my departure in the mid 1990s, but that model was not further developed after the driver replacements for the CS5i.