bi-amping cable arrangement

Anyone have any opinions on whether or not I should run my bi-amped speaker cables parallel or lightly twist them?

Were you able to hear a difference between running them parallel or twisted? If so, what were the differences.
You have them, make up your own mind.
The two runs of wires should be kept separate.
Twisting the single pair (plus/minus legs) has reasons. Twisting up two separate pairs together is a mistake*
*unless the wires are in a 'quad twist' which all four wires stay parallel but twisted together
While I wouldn't twist them, I would cross them at 90 degrees if practical and necessary.
Agree with the last post; keep the cables separate with a few inches distance between them...
Good point...crossing any cable carrying current at 90 is essential if you cannot keep the distance between them wide enough...