Also, a couple of suggestions from my experience.
1. For me, I was doing 500 cal of fructose water early in the going, which is about 11 tablespoons. Try increasing the dose, and if you don't want to have THAT much sugar, try the oil, but in either case, upping the dose would be worth trying.
2. I found much better results if I did the flavorless calories (oil or sugar water) as the first 500 calories of my day. In general, once I started eating tasty food, I was more inclined to want more of that throughout the day vs. having all of my flavorless calories up front. Maybe psychological but that was my experience.
3. Very late in the game (about 2 weeks ago), I started doing one of the things Seth suggested in the extra credit chapter of the book, which was to vary the flavor of the regular foods I was adding by adding random spices to everything I ate. Good God (!) did my appetite decrease dramatically. Whereby I had been having about 750 calories before dinner, and maybe 1,800 for the day (my maintenance calorie level is 2,200 to 2,400 w/o exercise factored in), it dropped to 200 - 300 before dinner and maybe 1,400 to 1,500 for the day. It was as marked as the initial results I had with just the sugar water.
Finally, Seth noted in that his very small "experiement" with a few other adopters, one took 7 weeks before he saw the effect.