Please forgive my candidness, but $2000 cables with $6000 dealer-priced speakers strikes me as a considerably unbalanced allocation.
In my experience, speakers do get considerably more resolving than the Harbeth 30.1s, enough that even hardware store lamp cord will not constitute a bottleneck.
For example, either the Joseph Audio Pulsars and Philharmonic BMRs would yield greater improvement than any cable.