Most experts on gluten sensitivity say to do the gluten free trial for 3 months. It takes most of us a month or more to eliminate all gluten from the diet because it is in so many foods, cross contaminated foods, supplements and meds, body products, stuck in the cracks in cookware and utensels, etc.
One reason that your stool is sticky could be that you may not be adsorbing the fats and oils eaten. The length of the stool is good, it's supposed to come out in a long piece. Stickiness could also be a result of using high fiber, metamucil does that to me. Too little fiber could also result in sticky stools. Blood can also cause sticky feces and often smells very bad.
If it is fats/oils coming through because the small intestine could not adsorb them it is called Sprue. Although some people have a wheat/barley/rye allergy the reactions to gluten which cause sprue are because of a (1)delayed autoimmune reaction in the case of Celiac Sprue or(2) non celiac sprue (Leaky Gut Syndrome) where gluten makes the small intestine more permeable allowing food antigens to start allergic reactions.
People who have developed the above types of sprue may feel better on a gf diet for a while but then feel worse, as their body goes into the first stages of healing.