If you locate the monoblocks next to the speakers and use very short cables, the influence of the speaker cable is minimized. That may be enough.
Given your setup, I would try a different amp before spending money on wire. The most recent Hypex and Purifi output modules are completely load independent, so you might try one of those and see if that helps the sound when used with your low-impedance speakers. The only review I could find of Red Dragon monos said they were not great at low impedances. Whether that applies to your model or if the manufacturer changed them, I don’t know.
There is NO speaker cable that will make up for a fundamental mismatch in amplifier and speaker, if that's what you have.
Just a suggestion for you to consider.