Don't have a definitive answer to the original question, but this is what I've been experimenting with since January.
GB 464 and CD wicks (starter kit from Candle Cocoon)
C-3
Midwest Container wax and soy modifier
Millennium
I have a sample of Northwood's coconut wax, but haven't tried it yet
This week I'm testing ECO, Premier 700, HTP, CD, CDN, and ribbon wicks in unscented, undyed Millennium in a 9 oz straight-sided jar. (Trying to find my baseline.) So far, HTP 105 seems to be doing the best, but I'm not convinced yet. I'm also liking how the medium ribbon wick is performing. Low, wide flame. I have a couple more burns to do, so nothing conclusive yet. Most of these test candles were greatly over- or under-wicked. So I'll probably repeat this test with the same series, sizing up or down according to my results.