A suggestion for wicks. I have used cotter pins that are around 4 inches long to hold wicks in the center while candles are hardening/setting up. I have also used the long bobby pins. I put candle wick pinched in either of these and then I put some masking tape on the both ends and to the glass containers to hold in place. This leaves enough room on either side of the candle to pour in your wax and you can adjust the wick easily if it shifts when you pour the wax in.
The photo on the right is of a candle with a poorly placed wick. The wick was about 20% off center. Because of the centering issue as well as a too-small wick choice, there was a lot of extra wax left after a full burn. As a consumer who spent over $11 for this candle, I was a little bummed about the extra hours of wax left sitting in the candle.