I see. I suggest you stick with the standard recipe, starting out with 22%. Learn the ins and outs of making proper biodiesel first. Even with the standard recipe you could go as low as around 17%-18% as long as you have bone dry wvo and you glycerine pre-treat your oil. That is what I usually do since I do not recover my methanol. A good portion of it goes back into the wvo when I pre-treat. 14% is barely enough to push the reaction since it is just above what is consumed to make the reaction. I always suggest learning to make proper fuel before moving on to other methods.