My understanding is the maximum usage rate (MUR) listed on the IFRA is percentage by total weight of product. 1% is 1g per 100g total product. I use the weight of the batter all inclusive (oils, lye and water).
FWIW, I'm finding that many of the FB FOs continue to change after the 6 weeks cure time. Some are improving significantly and getting stronger the longer they cure. Just something to keep in mind if you don't initially like something you purchase.
I saw some with 30 percent mur! I guess to be safe I'll always do per pound of oil. And test with usage rates under max
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