Speaker Jumpers

I am 100% with @bigtwin on this one.

My go-to is two use double runs of whatever speaker cable I am using, one full run to the LF posts and the other identical and separate full run to the MF/HF posts. However, when I am using single run (non-biwire) cables with jumpers, I usually connect the full-range cables to the MF/HF posts and jump to the LF posts.  I have several sets of jumpers I have constructed and my favorites use the same Furutech spades as your JumperFlux cables with wire mined from Harmonic Technology cables - 9awg, individually insulated, solid-core OCC copper wires in foamed PE. Those are probably overkill but I do some things just in case it makes a difference, and jumpers are one of those things.

Regarding your specific JumperFlux cables, based on the approximately 9.5awg wire specification, I suspect they are simply Furutech's Evolution Speaker II wires, which are fine stranded OFC copper wires with PE insulation. With those jumpers, I would be very surprised if anyone were able to reliably discern the difference in the sound of low frequencies compared to other suitable jumpers.   BTW, 200 hours of break-in is just rediculous.

My rule of thumb when I owned a audio store is use good quality cables 

same brand if possible ,and same like jumpers that match the speaker cables 

your end connectors critical  cheaper gold over brass Avoid , Siver or Copper 

3 x more conductivity ,3 x less resistance ,= lower noise floor.

that flushing sound is the sound of money going down the toilet lol

the marketing department earned its keep on this one... removed $ from wallet of gullible ocd audiophile very successfully

we have all been there

Hello Fire Water!  After 50 hours, and very short wires, I think you can trust you ears and ask for that (I hope you have one) money back guarantee.  Try some bare 14  guage zip cord or solid 14 gauge (or more) house wiring wire. You just want to be sure it's copper or silver wire you're using. Enjoy the Music.

Something seems amiss.  I don’t doubt you’re hearing what you are, but it’s just hard to fathom some presumably cheap metal straps sound that much better than much higher gauge OCC copper cables and almost makes me wonder if there’s something wrong with the cables although that seems highly unlikely.  Really scratching my head a bit over this one.