I am making a few candles with soy wax that my sister uses to make her own candles. A few questions....first, is soy wax a good wax to use to add fragrance oil to (I prefer a strong scent)? Second, is there anything I can add to the melted wax, color, and fragrance to increase the burn time? And finally, I have read some posts where they find 1oz of oil to 16oz of wax is sufficient, is that the quantity I want to start with? Thanks for you time and your help.