The CD player and cable seem pretty decent. Nothing against the Border Patrol, I have not heard one, but I agree with @jjss49 that you could try another DAC. The preamp has a lot to do with imaging and soundstage, you might try a different preamp too. That said, is there something specific you are missing?
What's Up?
Audio system source change suggestions? I’m considering options from a Border Patrol Sei SPDIF DAC back to the CD transport. Currently have Audio Sensibility’s Statement SE Coaxial 1.5m cable and the NuPrime CDT-9 with LPS power supply. On the other end of the system, it is all Odyssey Audio (Candela preamp, Khartago modified to Kismet level monoblock amps, and Kismet floor standing speakers).
How far up the food chain might I have to go with a CD transport and SPDIF cable to take the sound to the next level – improved imaging, soundstage, and tonal balance?