HI everyone, I've made pure peppermint, and also pure spearmint eo soaps before. Now I'd like to make a eucalyptus mint, or rosemary mint blend - but I'd like to be able to smell both scents. All of the euc/mint or rosemary/mint all smell like only spearmint to me. I have all 4 essential oils: rosemary, eucalyptus, spearmint and peppermint. Do you have any recommended ratios?