What polls are you watching because the polls I see mostly show Hillary outdistancing Trump.
My point was that if they wanted to churn up election turnout for the only poll that matters---the logical thing would be to keep the polls tight, maybe even with Clinton behind Trump a point or two. That would scare the base and motivate voters who might have otherwise stayed home.
Showing Clinton with a lead does Clinton no favors. It creates an aura of inevitability over time, and inevitable candidates have a way of losing.