Firstly check to make sure you are running the latest hotfix then if you are still having issues after that I would send your design into Cadence support / Channel Partner for them to review. You should be able to add / remove members of a match group without issue. For the last item check to make sure that the Class is set correctly in the schematic, if it's not - every time you import the netlist it will overwrite the pcb value with the schematic value.
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