I never use saran wrap so you might try taking it off the ones that haven't sprouted, since you've had success the other way.
If I read those specs right, your tubes are a couple years old. Thinking back to when I used Fluorescents (back when dinosaurs roamed the earth), I think they recommended you replace them every 6 months or so.
Like I said, been awhile though, so don't take it as gospel.
Good luck with your grow.
