(1) I’ve not experienced any bi-wiring performance improvements in my systems, and I’m in the “best-you-can-get single wire + jumpers” camp.
NOTE: bi-amping is a different story.
(2) However, others express different positive results in their systems. So here is the “diagonal bi-wiring” option to test out for yourself.
“ … Diagonal bi-wiring connects the red speaker cable to the bass/mid post and the black cable to the treble post. Then jumpers connect bass to treble in the usual fashion. I tested this arrangement out of curiosity and the results were pleasantly surprising…”
https://www.nordost.com/downloads/multiLanguage/NorseJumperinstructions_new.pdf
Each to his own …. Carry on.