I don't know if this is of any use (or you are doing all of this already), but it's from Corel's reviewers Guide. I don't use PSP so can't offer any practical advice I'm affraid.
"The Chromatic Aberration Removal Filter eliminates the colored glow that often appears in the high-contrast areas of digital photos.
To use this filter choose Adjust > Photo Fix > Chromatic Aberration.
Note: It's critical in using this dialog that the preview windows are shown. Make sure the Show/Hide Previews button is active. Use the Zoom in, Zoom out, or navigate buttons to zero in on the problem area. In the left preview window define the range by dragging the cursor to enclose problem area(s). Mark the Show
Differences check box to show which image areas will be affected. The affected areas will appear in the right preview window as white areas on black. The brighter (whiter) the area, the higher the degree of correction that will be applied. Note: If Show Differences is marked, click the Auto Proof or the Proof button to
preview the results on the image itself. Set the Radius (located to the left of the List of Samples area). The default value is 10. Usually values in the range of 4 to 20 produce the most acceptable results.
Mark the Result on New Layer box if you would like to automatically create a new raster layer and protect your original. Click OK to apply the corrections."