Oh man, that worries me to hear.
I'd worried a bit from the Pulsar Graphene issues reported in this thread that maybe this would happen between the Original Perspectives to the graphene version as well. Other Perspective Graphene owners have been very happy with the bass performance and yours if the first report I've seen of unwieldy bass with the Perspective graphenes.
I have the original Perspectives and have wanted to upgrade to the graphene version. I have a 15’ x 13’ room with a very wide room opening, which seems to allow larger speakers to "breath" pretty well. I am also able to pull them well out from the wall behind them, about 4 feet or so to the back of the speaker. The bass of the Perspectives is generally well controlled. Though it just occasionally on some content borders on too much. I’ve read that the graphene version has "tighter bass" but also "more bass" so it’s hard to know which directly that would take in my room.
Can you explain in a bit more detail why rear ported speakers have issues in your room? Is it a small room? Or are you unable to pull the speakers well out from the wall or something?
Thanks.