I don't know what you are expecting, but I threw your jpg in photoshop, stretched it out a little, ran a HLVG (green cast) and this is what I got. It seems about right for a slow system and unmodded camera. Your camera is probably most of the problem here, if you were using a CCD and HA filter it would be much easyer.
I would also think a flattener would be of some use, as there is noticeable field curvature.
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