For each brew you need to determine the API to add.
Just because the same amount of API is needed between 2 different oils, does not necessarily mean your brewer calculated it correctly.
I made it clear here, that it was a calculation error.
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I'm not going to dig up old lab results.
The most recent Mast P issue was also never addressed.
People seemed fine with it so i guess you indeed have a loyal* clientele.
Ultimately people that will buy, will buy with or without testing.
It's all a matter of price.