Hi Zuts, Is your Celestron balanced with a counterweight? If you have that heavy ED80 on top. alignment will throw off depending on the position of your scope. The fork arms will flex unevenly with the extra weight if it is not balanced.
If you dont have a counterweight, you can make one yourself if you are handy with a few basic tools.
There is one example here....
http://www.aussiepeople.com.au/asign...weightBar.aspx
Baz.