Incomplete bowels could be a medical condition. See a Doctor.
Most Gastroenterologists will tell you to increase your fiber anyway so you ight as well do it now.
They like you to take the fiber suppliments every day.
I like the "other" brand that is not Psyllium because it is easier on my gut.
I have IBS C and incomplete bowels are one of my issues.
More fiber both in suppliment and diet do help. And Pears are extremely helpful in the BM process.
I try to eat at least 3 or 4 a week along with other sources of dietary fiber.
My gastroenterologist suggested one cup of hot black coffee a day.
Also, Bowels need regularity sso try to figure out your body clock and arrange your coffee and food bowel helpers as close to a schedule as possible.
It's how the bowel works best.