First, you are technically making 1/11 dilutions (30 drops of EO in 330 drops to solution). For 10%, add only 270 drops of coconut oil, so you have 30 drops of EO in 300 drops of solution. But I doubt the difference in smell is worth starting over.
More important is, oil evaporates much more slowly than alcohol. If I put a drop of 10% EO in oil on one paper towel and a drop of 10% same EO in alcohol on another paper towel, the EO/alcohol paper towel will give me a much stronger initial smell than the EO/oil paper towel. But the EO/oil paper towel will continue to smell of the EO for quite a while after all the scent has evaporated from the EO/alcohol paper towel. The same is true if you put EO/oil on one wrist and EO/alcohol on the other.
Most important, as you'll see in a bunch of posts on this topic, you won't be able to dilute EO/oil in perfumer's alcohol. Oil and alcohol is like oil and water.
Oil as a base has the advantage of feeling nice on the skin. But I've found that oil doesn't make a nice mist if you try to spray it through an ordinary spray bottle. Drop formation depends on density and surface tension and they are both different for oil than for alcohol. So I suggest deciding in advance whether your final fragrance will be oil or alcohol based and just use one.