LS 60

The LS60 go down to ~30 Hz (+-3dB, anechoic), which means it covers most of the range of human hearing, since a room will typically extend the response. What you're missing isn't that, you're missing the ability to go loud enough for your use. Unfortunately for you, the LS60 isn't ideally suited for

And did you EQ them and room corrected them, properly with miniDSP or some other PEQ DAC or sound processor? I've built system on top of cheap 2xKEF Q1 and 2xKEF Q Concerto Meta with miniDSP for routing frequencies. And after room correction and EQ adjusting using UMIK - it measures better than my K

Yes, Radiant Acoustic is set to surprise us with a larger loudspeaker in February, as already described here: click. I am very excited to see the measurements and hear how they sound in the end. Personally, I prefer the Clarity 6.2 to KEF's LS60, for example, so if they could improve the bass range