Six or seven years ago, when I re-entered the high end, I bought Kimber 4TC/8TC biwire. It was just too bassy. Selling that cable and buying 4TC/4TC biwire did the trick. This is a very neutral cable, with no emphasis or de-emphasis which I can detect. It has particularly great low frequency extension and, considering the price, is one of high fidelity's great bargains. I suspect that where it may be less-than-state-of the-art is in its transparency. Even so, nothing has displaced it in my system in these many years and my system is quite high end, high resolution. I haven't tried the Goertz Alpha-Core and it may be better, but even if it is, the Kimber may be too good just to sell. It might end up in a second system.
Definitely, if I was weighing a purchase of 8TC/8TC, I would try to get my hands on 4TC/4TC as well in order to do a quick audition. You should notice a much less sloppy bass presentation and better midrange with the 4TC, if your experience is anything like mine. In my mind, you will almost certainly get better sound for less money.