That's a good start. The stars are elongated in a different direction at the bottom of the frame to what they are on the right hand side, which i think would be more consistent with CCD tilt rather than guiding (where I would expect the direction of the elongation to be consistent across the entire frame). Are you using a flattener at all?
My NEQ6 can manage 10min subs using my truss VC200L (which weighs >12kg with the camera and guider) if I am careful with polar alignment, so your setup (which i suspect is lighter) should be capable of 10min subs also.
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