3) The 'same' phase signal at the PIM and the Device averaged about 10 units more signal than the 'other' phase.
4) My PIM is on the 'other' phase!
It's pretty typical for the "other" phase to be lower than "same." If its MUCH lower, you can benefit from more phase couplers.
By definition, the PIM is plugged in Same not Other. Other would be Same if that were true.