Interestingly enough, Martin Dewulf at Bound For Sound has found that sometimes, directionality recommendations don't sound as good !
His is the only commentary I've seen on this, but he said something that might sound great with recommended direction for source to preamp might sound better reversed preamp to amp (one example).
I'd recommend, unless there is some special grounding/shielding scheme that REQUIRES directionality, to try it out both ways, and see if/how they are different.
Good luck, and more importantly, have fun !
Todd - chams_uk