Hi Jack, here's a fixed version of the booleaned pan object, I separated out the bad surface, selected its edges and hit delete to untrim them, then used Edit > Join to glue it back together.
Hi Jack, I've tried to recreate the misaligned blend but it doesn't seem to be happening here. Do you possibly have a version saved off just before you did the blend so I could test that step?
When you make a closed blend in the blend options stage of the command there will be 2 points in the viewport that you can drag to adjust the seam location. if it's off you can fix it there but if it's making it off by just that slight amount in the starting default seam location that could be something I could probably tune up if I could repeat it happening.