First of all, I take my hat off to you for your desire to succeed. When I read your post mentioning Wicks Unlimited, I just knew that how hard you are working on this.
I see a big problem with you using 6006. No matter what you do, you are not going to be satisfied with the result because you have played around with 464. 6006 might have given you little better CT, but it's going to be a lot inferior HT compare to 464. May I ask why you have stopped using 464? For your 8oz tin, I believe outside diameter of your tin container is 3 1/8 inch. If that is right, then you might want to try ECO 16 trimmed to 1/8 inch with 10% fragrance oil load. This is not going to be perfect, but very close. Still, it is going to produce inferior HT compare to 464. *ECO 16 is not going to work for your 8oz tin container with 464 wax.
I don't know what's your definition of great candle, so I cannot say much. But, you might want to consider talking to private label candle manufacturers and find out what they can offer. This is one of the ways to learn about this industry. Wicks Unlimited was another good way to approach, which you already did. Also, check out Atkins & Pearce, Inc. website. They are manufacturer of your HTP wick, and it will cost money to do wick test with them. Also, I believe their minimum order is 10,000. But, you should check them out. Because they have a lot of interesting wicks that regular candle suppliers don't carry and a lot of useful information on their website.
As for the FOs, let me give you my experiences. I walked into one supplier which carried about 70 FOs. Out of 70 FOs, I found 4 that I liked. Another supplier had about 180 different FOs. Out of 180, I found none that I liked. I keep ordering sample size FOs by mail order, but so far I only have 6 FOs in my product line. In my opinion, finding the best FO is going to be life long search! Did you know that there are about 3,000 different Rose fragrance oil available on the market? I was lucky to find the right Rose FO from the 4th try. What I am trying to say here is that sometimes it might not be your candle making technique that is not producing the right result.
Oh, try not to heat up the soy blend wax above 185 degree. Soy wax will burn slightly, if you go above 185.
Have fun on your journey! I have feeling that you might surpass us in the feature with your kind of hard research and work.