How much fragrance oil per candle?

Hey there! I just started making candles last week and made a couple test candles with varying levels of fragrance. I used a 4oz jar for my candle and started by adding 1oz of my fragrance to it at 185 degrees. I worked up to adding 1.5 oz of fragrance for my last candle. After doing a test burn the candle isn’t very pungent with the scent. You can barely tell it’s there. Do any companies make concentrated scents? Or do I add more fragrance oil?