After months of having no problem something changed, the raft is still easy to remove from the perf board but almost impossible to remove from bottom of the object.
I had tried re-leveling the bed and reducing the print temp. by 5 degrees but that did not fix the problem.
Then I noticed what appears to be an additional layer between the raft and the object as shown in the attached photo.
I assume I changed a setting somewhere but I don’t know what, does anyone have any ideas?