Carbon Fiber clutch packs in diff, Do I have a problem?

I had the diff rebuilt with the FRP carbon fiber clutch pack kit, new FRP 3.55 gears, shims and bearings. I also used royal Purple fluid. After about 4K I checked the fluid and noticed small granuals of the carbon fiber material in the fluid. Is this normal after break in?

It's runs smooth with no noise or whine and grabs tighter than stock so I'm not sure if I should nbe worried?

I called the FRPP hotline and they said that it was normal break in. Nothing to worry about and no need to change fluid.