Cedarwood Texas EO doesn’t dissolve in alcohol.

I bought Cedarwood Texas EO from a local supplier in their packaging. It’s claimed to be perfume-grade oil. When I tried to dilute it in alcohol, the oil didn’t dissolve and stayed as droplets at the bottom. I asked the supplier what the issue could be, and they said it’s probably because my alcohol isn’t concentrated enough. My alcohol was from another supplier, also labeled as perfume-grade. I ended up dissolving the oil in DPG and forgot about it. However, after another unpleasant incident with the same (oil) supplier, I decided to check my alcohol with a hydrometer and got 90%.

So, here’s my question: What concentration of ethanol is needed to reliably dissolve Cedarwood Texas EO of "perfume quality"? Could it be that, as Google suggested, my EO contains carrier oils that don’t dissolve in alcohol, meaning it might be diluted? By the way, the odor strength of this oil also leaves much to be desired, but I don’t have enough experience to judge for sure.

Also, should I continue using 90% alcohol? Could there be any other significant issues with it? It doesn’t have any noticeable additives, so I assume it just has excess water. I’m not planning to make finished perfumes yet, just experimenting with scents, and my budget is pretty tight.