Hello, I recently started to make candles and I am facing a problem. After I poured the candle, I allowed it to cool down until the surface is solidified. Then, I would poke relief holes as instructed by this website. I let the candle cool down for a bit more and I pour the remaining wax to fill the relief hole. But, after the candle is cooled down all the way, I see that there is two visible layer. There is a layer from the original candle and a layer that is poured to fill in the relief holes. Does anyone have any tips? Also, my candles do not smell as strong as I wanted it to be? I believe it is because I added the scents at the wrong time. When should I add the scents? Thank you for helping!