Try adding KEF KC62 subs. I haven't heard the R series, but for the money, I think the sweet spot may be LS50 W2 with a pair of KC62s. The KEF Contact app does a great job of integrating speaker and sub.
My current setups are Reference 1s driven by Ayre gear and an LS60. May sell the Reference 1s and Ayre gear and keep the LS60.