Beacause the candle is poured at a lower temp it will set up faster. Therefore, the fO will not have time to settle in the oil/wax. This should have no effect on the scent throw. If you believe it does then you have to ask your self, frosting or throw. Although, I don't even think this is a question. I have often said that there is 100 ways to skin a cat. This is true with making candles. If you believe that pouring at 175 creates a better scent throw, then by all means do it. I personally don't understand where the FO goes is adding it at 125 or 175. I know a lot of people who do it both ways. It doesn't mean on is right or wrong. Bottom line- Do what is best for you.