Oils do not diffuse well

Arrived exactly as pictured. Very pretty. Easy to clip on. Plenty of felts. However oils don’t diffuse very well. Even saturating the felt with what I consider to be a wasteful amount of oil, there’s hardly any scent. Even in my truck. I had better success with one drop of oil on a wooden clothespin clipped to the air vent. I don’t want to continue to waste my oils, so I’m going to try to modify the design. Maybe drill larger holes in the back? Use a more gauze or flannel-like fabric vs the felt? I’m thinking it needs to be easier for the air to pass through...

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