I have the same problem, I also replaced my wires with FRPP's.
I did notice a stronger pull above 2000 RPM's though. I'm going to do a little research before I return them. (Platinum +4's)
Let me know if you come up with anything further, email @
cliffymiracle@hotmail.com
Is yours especially bad at 1200 RPM's?
I'm waiting for a response from BOSCH.
It's the plugs...