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Must be missing something mate, as I am using a 60 or is a 65 mm guide-scope, and don't seem to have a problem.
I would ditch the Barlow though, I have never used one, and even recently went through a stint of using a converted 8x50 finder objective with the QHY5 in place of the eyepiece. Worked a treat.
The 70mm should be fine.
Gary
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