I'm not much help here at all, but I have heard using citric acid can be very tricky. I used Borax for a couple of batches and had issues. Now I don't use anything at all. For water & KOH amounts I use the calc here. They have it adjusted to take the water content of the KOH crystals in consideration. For my FO's I've been using between 1/2 oz to 1 oz pp. One issue I've run into is my FO thickening my dilution back up making me add more water in. LS has been kicking my butt, let me tell you! But I am catching on finally!! If you haven't yet, get Failors' Liquid Soap book. It really is a great book. Also, there is a Liquidsoapers yahoo group you may want to check out. Before I jumped in I read about several different methods and thoughts which have helped me along. About.com has a couple of really good articles about it as well as a Crockpot recipe. Good luck!!