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Paul,
Zoom lenses are no good for 35mm adapters as these are light hungry. Zooms usually starts at f3.5. A good f1:1.4 or 1.8 lens should give you good results with no or very little vignetting. As for your your edge softness, most likely it's your achromat. I get that when I use a cheap +10 macro lens on my FX1. Also the canon 50mm f1.8 lens might be the one giving you the barrel distortion. A PCX lens might be giving you the barrel distortion too.
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