@stuartk fwiw I obsessively test both inter-mixed and identical cables end-to-end from sources, to preamps, to amps. In different types and orders too. While each cable is "not supposed to have a signature" according to some folks self guided rules... imo they ALL leave a signature good, neutral, or bad. Each pair of cables, including the in/out on the Lokius itself, and downstream cables of different types, will all impact the results somehow. Try different combinations and orders of what you have for now. It can be fun.
You can try putting your best pair first in order and down-order from there. Or, can even reverse the order of quality for a different affect. I'm doing this now in a fairly transparent all tube system (tube DAC, tube Preamp, tube Monos amps), with same brand OFC copper IC pairs first up front, OCC copper IC pairs downstream in reverse quality order. Sometimes my full loom of all OCC or all silver end-to-end is not the best. The "blend" of the two types and orders can also produce a rewarding result too. Try it with whatever you got. Best of Luck.