We use one continous line for both traps on each side with a stainless thimble locked in with a Brummell splice. I used to slide plastic tubing up there for fear of chafe, but I stopped doing that some time ago as there was never any wear marks on the rubber.
This is definitely the wrong way. Doing it this way will load the fibers at the crossover and not in the bury (because there isn't any) and ultimately lead to broken lines much sooner than if they are spliced independently.
Splice them each independently with some cover over the loop. Replace every 2 seasons to make sure they are OK (spectra is cheap).
