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well, is it really that bad with your newton? if so, my first point would be to get it collimated correctly as this influences visual appearances the most. Get a good laser collimator and follow the instructions or search the IIS forums/articles on how to - itīs a 10min task and provides a lot improvment (should be done regularly anyways with newtons).
the thing barlows is that there minus-element partially corrects field curvature but you loose brightness and field of view (FOV) as magnification for any given eyepiece doubles or more (depending on the barlow of your choice.
There is always a little imperfection even with scopes much more expensive than yours but almost all scopes produce sharp images in the centre of your FOV. Also, I might be wrong here but I guess you are using some mediocre standard occulars (or eyepieces if you want) and they too could be the reason for your lack of space-walk-feeling / or they actually prevent you from seeing the field curvature of your prime mirror at all as they only deliver 50° apparent FOV.
Can you provide some more details on the type of scope and occulars and what flaws you actually observe when using it?
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