Hi there.
I too have never seen problems quite as bad as this.
When I first saw the photos, I thought right away that the mirror had the wrong focal length for the tube.
After reading all the comments that have been posted on the problem myself , I still think the mirror could be the wrong focal length for the tube.
You almost confirmed this to me when you said that moving the secondary spider away from the primnary has almost fixed the problem, but not quite.
Having said that, I also had trouble with eyepieces many years ago, by way of the images being distorted due to poorly alligned lenses in the eyepieces ( 2nd hand ones ) The eyepieces may have been dropped to move the lenses off centre.
My eyepiece comment is just a thought.
You may like to borrow some eyepieces and try them in your scope to see if they make a difference.
If they dont, then its definately the scopes optics that need to be addressed.
I hope you get the problem sorted out soon so you can start enjoying your new found pastime.
