I too have enjoyed he use of Tasco scopes without any problems. True they are not Nikon or Burris or some other more expensive optics but the ones I have seem to remain clear and zeroed.
Semi, I am glad you found your problem. And as it is with most instances - operator error!
And BTW, you will always get a flyer in your groups. It's just my way of saying "I'm watching you and I know you're going to screw this up again!"