I recommend a food diary to measure transit time.
Here's why; jpouchers were always recommending oatmeal and applesauce as good thickening foods that also had a longer transit time. However in me, those foods had the opposite effect and caused me to be in the bathroom more frequently. We are not all the same, even though we had the same surgery. I'm sure your husband would be a lot more comfortable with a lower frequency. Have him write down what he eats and at what times. This will help him to tailor his early recovery diet to something that is manageable. Note that for the vast majority of us sugar will make things looser. And that includes fruit juices. So steer clear of sweetened foods and beverages if needed. Another thing to try is eliminating the heavy carb diet he appears to be on and go with more protein. All those carbs could add to more gas too.
It's really trial and error, and very individual, which is why a food log is helpful.