Perhaps 4 weeks was a little too optimistic on the part of your surgeon.
It took months for things to settle down. I was very depressed over my poor pouch function in the early days. Many people have including myself share your experience.
One of the strategies I employ is taking Imodium 3 times daily, breakfast, dinner and bedtime. This slows down digestion just long enough to give me apple sauce consistency.
Unfortunately, i am stuck on this medicine; if I stop it, liquid and burning stool will soon follow.
Hang in there, it does get better, but it does take time. You will get more responses here. And you will figure out over time, what to eat, when to eat, and how much to eat. These are the things they don’t tell us pre surgery.
We have to learn and advocate for ourselves.
You have come to the right place!