Sounds normal! I experience the same sound with my Corse slipper. From time to time, I apply a new coating of white lithium grease which makes the metallic rubbing sound less.
Does it make the sound go away or just less? I picked up a 1098 with a Corse slipper and did the white lithium trick. Improved the noise by maybe 30% and grabby-ness by 50%. Wondering if that's all I should expect.