I had the same problem with my Studio 60v.5. I was driving them with the Onkyo A-9555 integrated amp (85W @ 8 Ohm) which is a class D amp. The sound was very detailed, lean, and the highs were absolutely painful at times. I don't have any room treatment, but my living room has plenty of soft surfaces to at least partially tame the highs. I decided to try out the Exposure 2010S2 integrated amp, and what an amazing difference it made. All the harshness disappeared, the sound was fuller, instruments and voices had more body and the highs were detailed but not harsh at all. The main culprit was the Onkyo amp, which didn't agree with the speakers at all, although I'm sure that my untreated room contributed to make the highs harsh as well. The Exposure amp and the Studio 60 v5, seem to have a nice synergy and this works very well in my room. I'm absolutely enjoying my system now.
Don't give up on the Paradigms just yet. I suggest you try out the Paradigms with a different amp, and they might just surprise you.
Don't give up on the Paradigms just yet. I suggest you try out the Paradigms with a different amp, and they might just surprise you.