As an update , the Furutech cable, connectors arrived. The spade connectors still stripped at the cable support, but held firm on the actual conductor connection. Resistance values are all below 1 ohm now. The new cables are a different sound than with the SPC 10 AWG, not worse for sure, more relaxed, certainly no loss of fidelity. Can listen for hours without fatigue.
The cable itself is marked Furutech and dimensions match the specified sheet from Furutech. Are they fake or just surplus from.an older design, I’d go with the latter.