I also have what I prefer to call a redundant colon (it is the same thing), but it was termed 'severe' by the gastro doctor who did the colonoscopy. I have never had any polyps (looking up the term tubular adenoma, that seems to be how most polyps are categorized). Congrats on having only one. Diet matters, in my view. With only one polyp, I don't know what colonoscopy schedule that puts you on. Your gastro doctor should have told you and if s/he didn't, it is likely in your charts.
Redundant colon can cause digestive issues and one of them is constipation, which I have; it definitely makes me feel 'full.'
For my redundant colon constipation, I drink more water and eat cooked rather than raw foods, and that seems to help.
What I am also just now trying out is sleeping on my left side. According to a Healthline article, sleeping on your left side, recommended for IBS, redundant colon, etc., gives the waste processing aspect of your redundant colon a gravity assist. Gravity pushes it along. Only two days in, I can vouch for it preventing constipation or incomplete evacuation. But it has only been two days.