Well from my experience I noticed power drops if adapters/couplers are used. It’s the thickness of the cable as well. The one you bought is 24/28AWG. Maybe try thicker cables (i think usb standard cables can go as thick as 20AWG) or try soldering what you have to eliminate the coupler. No guarantees..

In my snes/sfc enclosure setup I had to use thick cables cut from a pc psu because the normal microusb wires would give me that colored square.