Regarding the oil substances and the enteric coated capsules.
I think it is HIGHLY likely that the oily substance you saw in your elimination was infact the contents of the enteric coated fish oil capsules. Any time your doing a cleanse, your sweeping contents out of your GI track a lot faster than usual. Also, the surface villi of your intestines is becoming coated in the psyllium stuff. So, it makes absorption of many minerals (and oils) more unlikely.
You can of course re-check whether this is infact from the capsules simply by skipping several days of them and then taking another and waiting for the "results".
Exercise is an EXCELLENT way to motivate the bowels. In cultures where individuals are far less sedentary, there is far less instances of GI disturbances. So, whether it be walking, kickboxing, pilates, or in your case jogging, getting the lower body moving is an excellent way to stimulate elimination.
I wouldnt however be so quick as to say that the last cleanse didnt make it though. Your body may have simply had time to "clean house" in absense of a cleanse and is now resuming throwing out the garbage. Keeping your activity level up will decrease the total time it takes to accomplish your complete cleanse.
I caution you to be careful with your calorie levels though - being at 1500 is definetely on the low side. Not so much for life as for while also detoxing AND exercising. Both of these put stress on the body, and you run the risk of simply fatiguing yourself in a way that could take months to show up and years to heal. Be kind to your body - its working hard for you! Also, remember that calories are not nearly as important as the TYPES of foods your eating... whole, high-quality foods will serve you better in the long run. Raw foods contain a MUCH higher level of both roughage and enzymes that will assist your cleanse. Good oils, such as olive oil and coconut oil, will assist your metabolism and your detox. Beware of all things artificial and overly processed.
Drink, drink, drink water! (However, yes even water can be over done. 4L is about the top amount for almost everyone. Less if your light framed. That level or higher puts a strong risk that you will unbalance your body's electrolites. Several professional cyclists end up hospitalized or dead yearly by doing just that. I personally do 2-3L per day when not detoxing, and slightly higher when I am.)
Okay, there you have my very long-winded 2cents!