I'm not saying you got it wrong just thst rae purity even if it was completely wrong is not the cause of the final results.
It could be mistake on both side of the fence hard fo say which one
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What are you using to measure everything? Like I said it would either have to be 104-105% pure (not realistic) or brew issue to get to that target.
For benzyl alcohol and benzyl benzonate I used 10ml and 60ml syringes. For the MCT oil I weighed 10ml of it divided that by ten and multiplied that out to get the correct volume. The oil came up to where I expected it to on the beaker. I saw this method mentioned somewhere and liked the idea