I have used metal core and flat braid wicking for my pillars and have had really good results. Don't be afraid to use what you have on hand. Just make sure it is the right size for the diameter of the candle.
Good thermometers have the different temps for different candle types.
The softer wax is what you want for container use. You use this type of wicking because it is slow burning and it stands by itself. I use a zinc core wick. Good thermometers have the different temps for different candle types.