I usually scent at 5% of my oil weight. I am wondering, however, if I leave a portion of my batter unscented (like to compensate for a discoloring fragrance, or for piping), should I calculate percentage based on the scented portion only, or can I calculate for the total batch oil weight? I am wondering about this especially for certain fragrances that have lower max use percentages (which I tend to avoid for this reason).