If I was to make a fragrance journal I would include the following sections. Fragrance name, how much i used, cold/hot throw, info on if it was a blend of fragrances, if i needed to wick up/down due to the fragrance, and if the fragrance morphed in anyway after adding it to the wax.. I would put all this info into a sort of spreadsheet that i could just fill in the spots needed with the corresponding information. This info would all be handy in case you ran across a fragrance later that you thought you had tried. It would make it so you might not repurchase scents that did not work for you by accident. As well as giving you a good way to find the fragrances that worked best in your testing as well.