Hi ChrisBo;
Well, you know that the science behind biwiring is questionable, and although I did not hear a difference, I ended up leaving the biwire in place.
I understand that having the two cable sets run seperately maximizes the benefit of a biwire setup. That is, shot-gun biwire is better than biwire along (and it does not cost anything) so keep that in mind.
Finally, I found that amalgamating into one banana plug at the amp end (you will need to open the wire, splice, and protect from oxygen by tight plastic tube sheet), provided the neatest solution. That means, if you have 2 9Gau wires, that you will have a 6Gau combined wire going to the amp post in one plug
Have fun.