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aaron,
this is what i think has happend . your Secondary is not pointed to the middle of your primary this happend to me on my old blue newt never ever got a clear picture.
My 10" SW although bright as hell, almost blinding although it is crisp and clear so you do not need a apterature block maby you could use a neutral densitiy filter....
Your collimnation is the culprit.
have you got a laser collimnator and a cheshire? this is one of the most effective ways of collmination in my eyes...
Laser to get the depth of your secondary and angle, then the cheshire to get the primary lined up. with this method i can get almost perfect concentric rings with a 20mm and 5x power mate which is up around the 300x mag.
There are not too many truss tube dobs that dont need a good amount of collimnation everytime they are set up due to the movement of the tube. once you get it close you wont need too much fiddling to get it spot on, but if you have just brought it for 100km/s it will be shot! give us a hoy if you need a hand.
oh and to make sure your getting enough movement use some grease proof paper take out the 1.25" adaptor (2 screws on the side) and hold the paper over it, then wind the focuser in and out till you get a nice crisp point on the paper, if you don't get this point theres something wrong with scope the truss tubes arnt long enough
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