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I am by no means an expert on optics, but I would think that if the eyepieces work fine in the 5" scope then the error lies with the 10" scope. If the eyepiece performs perfectly in the 5" I don't see how there could be any problem with it.
Is it possible that the 10" scope is not capable of the wide angle the EP needs. I think the 13mm Nagler is an 85deg FOV, and the pentx xw would be something similar. Maybe the 10" cannot handle that wide a FOV. I have this exact problem in my 10" scope with 52deg FOV EP's. I do however suspect the EP's as they are cheap ones but I have never tried them in another scope so who knows.
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