After I was prescribed Creon at a starting dose of 24,000 lipase units, I optimized the amount I needed for a specific meal by keeping a daily food journal. The starting dose was calculated using the formula provided by the manufacturer which is based on the patient following the recommended diet predominantly non-fat and low fat. Although the dosing calculator Abbvie has saying for my body mass (120-130 lbs), I should take one 36,000 capsule, the 24,000 capsule has been satisfactory for most meals as I stick to non-fat and low fat fairly consistently.

By keeping a daily food journal noting day/time, type of meal, quantity and fat content and then noting the GI symptoms and stool characteristics 24-40 hours later (the time it takes for food to be digested and excreted by an adult), I quickly identified what meals (fat content, portion size) required more pancrealipase. It did take long to optimize as I kept to a consistent diet the first month. Slowly I began increasing the quantity of type of foods which included some additional fat. Already having a good idea of what was working, it became easy to extrapolate when to add more pancrealipase capsules to keep the GI tract functioning normally.

An oily sheen and stickiness of the stool is likely caused by undigested fats indicating more enzyme is likely required. When taking capsules, I take my first capsule immediately Before or after the first bite and then stagger taking additional capsules throughout the meal. This keeps a consistent level of enzymes in the intestine available to digest the target substrate (carbohydrates, fats, proteins). By staggering, it more closely resembles how a fully-functioning pancreas works which produces and secretes enzymes in response to food entering the intestine and sending a signal to the pancreas by way of releasing a hormone that binds to receptors in the pancreas that more enzymes are needed.

If optimizing by increasing the number of capsules to the maximum suggested by the dietitian is not achieved, the manufacturers and dietitians suggest trying a different Rx brand. Although all the Rx brands are derived from porcine pancreas, they differ in performance within and between individuals as a result of how the enzymes are extracted, processed, purified, concentrated, the time-release coating used and binders and fillers added. For these reasons, one should evaluate different brands if the first one does not perform optimally. I also stick to recommendations of PanCan.org and dietitians of avoiding fats, red meat in moderation and the vegetables that are hard to digest.
https://letswinpc.org/managing-pancreatic-cancer/2019/10/09/pancreatic-enzymes-explained/
https://flatulencecures.com/vegetables-that-cause-gas/
http://media.pancan.org/pdf/patient-services/booklets/Diet-Nutrition-Booklet-Digital.pdf