I would sell the 8TC and buy a better wire (like AZ Satori) and run it single for about the same money as the 2 you mention, which are a little thin sounding for my tastes.
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I am currently biwring B&W Matrix 802 III speakers with Kimber 8TC(low) and 4TC(mid/hi) and I like the sound.
I previously biwired low and mid/hi with 8TC but I like the 8TC/4TC combination better. It is less bright than all 8TC and the bass seems a bit more prominent.
I once had the B&W's single-wired with 8TC, but that was several years ago. As I remember, moving to biwiring was a significant improvement.