KEF LS60: Distance from wall behind them

I just set the LS50 W2 to wall mode, and it changed something -3 dB, not sure what. The LS50 W2 are 28" from the wall behind them. I imagine I prefer the sound now with that setting, seems a bit less colored

I have no problem setting the LS60s where the Reference 1s are now.  The Reference 1s are augmented below 80 Hz by a pair of Velodyne HGS 15s with acoustic room correction.  I assume there will be no problem using the subs with the LS60, but might bypass the crossover of the SMS-1 bass manager given the KEF Contact app has bass management.  Im not sure how Contact and the SMS-1 will play together.

Haven't heard e LS60,. just read and seen reviews.  Kal Rubinson's review for Stereophile was the most convincing.  At 87, I'm aiming to simplify with a setup that's easy to use but sounds good.  The KEF Reference1s, driven by the  Ayre KX-5 Twenty preamp and VX-5 Twenty amp, sourced by Ayre QX-5 Twenty Roon-ready DAC and DX-5 DSD disc player is a tough act to follow.  I'll be keeping the Ayre disc player and phono amp.  it's most likely I'll buy a LS60 next month before I sell existing gear.

IIRC the Velodyne SMS-1 does both low-pass crossover and bass management. The first is a simple setting of frequency and slope, the second entails acoustic measurement of sound generated in the room. You can let the SMS-1 seek a solution based on the measurements as it adjusts its way along the spectrum or you can tweak the bands if you’re so inclined, and there are lots of things to tweak. Full range analog goes from the Ayre KX-5 Twenty preamp to the SMS-1. I’m assuming analog will go from the pair of LS60s to the SMS-1, but the KEF Contact app may low-pass it. I may be wrong. Of course the SMS-1 sends room corrected analog to the pair of HGS-15s.

I haven't replaced the Reference 1s with LS60 yet, but I have a rack of Ayre gear and at 87 aim to simplify.  Kal Rubinson's review in Stereophile suggests they provide excellent sound quite close to Blade 2s.