Am I the only one with the Dob (12" Bintel) that can not reach focus

I need to go in with the focuser just a bit more.
With 2x Barlow I can, but just. With Barlow its OK with The Moon but Jupiter drifts away very fast.
What can I do in order to get camera in focus without Barlow. Some focal length reducer or I need to extend it?
thanks
bob