I just shake the front risers or just wait it out. Next flight I will try pulling both rear risers and see if it makes a difference. The only time that the end cells being closed worries me is when one stays closed longer then the other and I go into a turn.
I always use the rear risers to get me heading toward the landing zone or to conduct any avoidance maneuvers I need to do. I never un-stow my toggles until the end cells are both inflated and my slider is stowed.
Thanks for all the input and responses.