With out seeing the affected images it is really hard to determine the issue.
First make sure you are stitching Drum or Full Frame (there is a personal joke here).
I think the reason PW 4 has X and y dimension adjustments is because sometimes inside the camera the SENSOR is not perfectly aligned with the perpendicular lens axis. Means the sensor is off center from the center of the lens. Even different Canon 20d camera sensors can be off set by a few microns.
PW4 allows you to adjust the center of the sensor/ image with the lens as well as.. making cropping adjustments to remove the black background and light fall off purple fringe the at the lens edge rim. Thats where the glass meets the metal lens housing.
If Drum.. check the image "sensor" alignment X and Y and R for radius by trying to make it larger or smaller radius.
------------- /s/
Dave
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EasyPano - Panoweaver
Pano2VR
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