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Hi Keith,
The barlow shouldnt affect the focus point that much, I have a LONG 5 x Powermate and it doesnt affect my SW12" collapsible much at all, sure I have to refocus, but when I do, its sharp.
You might find that the barlow lens may be filmy on the inside or outside, or perhaps you can unscrew the end lens element (mine does) and clean it with a soft lens cloth.
Either that or the 2 x mag is too much for the seeing?
Wait a sec, triple check your collimation because even a slight misalignment shows up badly when barlowed. If you havent already, invest in a laser collimator, using this on a collapsible is a doddle coz you can see the return dot on the secondary. This could be the issue.
Good luck.
Chris
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