Actually I have got more updates to share here!Thanks for sharing your experience!
Basically, been playing around with my limited collection of cables on K9 Pro with my EJ09 this shocked me and non-scientifically "test" with my not-so-great hearings and found that cables hardly make a difference when using K9 Pro! My random guess would be that, with portable device rely on battery power, material compositions and materials / impedance / impurities will become obvious for sensitive IEM drivers.
However, with ample power from the desktop machines, there just so much power and cables will not make a difference. This also explained why some folks felt this whole cable thing is such a snake oil. I can tell very clearly the differences when swapping cables in my portable devices but it is neglect-able with desktop DACs. These being said, I am now using the stock cable come with EJ09 which has native 4.4mm jack and sounds great with my K9 Pro.
Ps, all those adopters need to be high quality, audible improvements when using crapy ones vs well-made branded one (all my cables are 2.5mm so for my K9 Pro has to use adopter for 4.4mm port).