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The problem you have here is field curvature. For some reason people think RC's have a field corrected optics. This is not true and as a result the optics still need a flattener/reducer to flatten out the field. Your image looks well collimate to the point that any mis-collimation is barely noticeable.
You are using a large sensor on a field that could only support a smaller sensor like you had before and hence why you were getting "semi decent" results before.
To get around the problem you need to use a flattener/reducer. If you use a reducer it must have flattening abilities.
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