Well mine always goes away once the trans has warmed up, I never have an issue with it after high rpms, but I NEVER get on it until the motor is fully warmed up.
I think spraying some grease/WD40 on the sleeve will help and since the trans will be down the sleeve can be lubed without any worry of spraying the clutch area. I don't think I would try spraying though the cover plate but that's just me lol