Maybe also consider Furutech connectors? Furutech seems to get good reviews from DIY cable types…
https://www.thecableco.com/catalogsearch/result
Although a bit above your $10/foot price target you might also check out Audio Envy that are still pretty cost effective and get great reviews…
https://audioenvy.com/product/monitor/onestian-g10-pair/
Incidentally, I reviewed the stereo version of your amps and found it to be outstanding and one of the best amps I’ve had in my system, especially when in high-bias mode. Peter REALLY wanted me to do a follow-up review of the monoblock version as he was adamant they were a big step up in sound quality, but unfortunately the publisher wouldn’t go for it. Really great amps you’ve got there, and best of luck with the interconnects.