It would be interesting to hear this sound you are describing..any way you can get a sound file of it? If its doing that at only 7 psi, then something isnt right..Crap, I ran 10 psi for a short while on the stock clutch without one issue..I'm at 15 psi now on my 4 puck ceramic, LUK PP and fly, and its doing ok for now..

As for the restrictor, just follow the fluid line to the slave cylinder, and where the line goes into it, take out that banjo bolt, and behind that, is a small piece of metal with tiny hole in it, and a small spring behind the metal that is attached to the restrictor. Just take that out, put the line back on, and bleed the clutch lines. Simple as that. Just be sure to bleed it very well.