I do believe that a soy candle will get stronger with time. I've found that the longer the better, but the majority of curing is done in the first week. I've also noticed that some FO take longer to cure than others. You should also know that soy reacts with FO's unlike inert pariffin. This means that certin FO will or will not work with soy. An example of this is a candle that has a very strong cold (not burning) throw and a non-existant hot (burning with a 1/4-1/2" melt pool) throw. It takes me on average about 4-5 different FO's of the same general scent to get one that I like and works in soy. You should see the testers laying around just to get the 12 different candle scents that I have now. Once you get some experence with testing FO's, you'll be able to know when you got a keeper. The Peak FO's that I use in my candles are Spiced Pumpkin, Key Lime, Watermelon, and Vanilla Passion. I've tested the Macintosh apple and found for me it had an awsome true to life cold throw, but no hot throw. If you what to experence a strong cold and hot throw FO, I would recommend testing Peak's Apple Jack & Peel.