Ok, maybe I answered my own question - I just thought of searching on the ez wick multi setters to see how those are spaced. Like this: http://www.candlescience.com/equipment/ez-wick-setter-multi Its obvious they are centering the wicks within the neck diameter, not the jar diameter. This follows the pattern of candles I have seen sold in small craft stores then. However, if anyone has ANY additional hints, such as how fast I want a meltpool, or other things I should look for during testing, I'd really appreciate it. Thanks again.