Thank you for moving the posts, it's more organized now.
I find batch variations with Ajmal. I only tried one batch of the exclusive stuff, but no doubt there should be some variation due to the quantity they produce. I have also smelled plastic smells in oils from the top guys. Even strange notes from out of this world. Also, some oils from the top makers make me nauseous if I sniff it too much. Some make me dizzy, I guess you can compare it to sniffing glue. Also, oxidized oils tend to make me feel yucky if sniffed too much. Some oils stink when smelled up close, but are beautiful from a distance. Oud oil is very complex, how you receive it can vary a lot on temperature, indoor/outdoor, morning/night, other scents recently sniffed, your mood, associations, etc.
To have a good experience with Oud you have to be knowledgeable on when and where and how much plus other factors and intentions. It's a fine art, and if you are having a bad experience, seek advise, don't slam it.