It definitely sounds like a focus problem as David suggested.
A common problem people have with the Skywatcher Dobsonians is that they have both the 1.25 eyepiece holder and the 2" eyepiece holder in together.
These are alternatives.
Assuming you have standard 1.25" (barrell) eyepieces, remove the 2" adapter from the focuser.
I have a Skywatcher DOB and would be happy to help you with any further issues.
The secondary obstruction you mentioned will not be apparent when the object is in focus.
PS: This is a great scope - good choice.!
Oh, and Welcome to IceInSpace
