Drivetrain Throwout Bearing On Wrong Side Of Retaining Lip. Clutch Slip?

Try this test. Set the parking brake hard. Hold in the clutch. Put into 4th gear. Rev the motor and dump the clutch.

Does the motor die or continue to run?

IF the motor dies, then the clutch is holding as it should.

If the clutch is slipping because of an installation error then likely it would slip almost all the time. A slipping clutch will only heat up and slip more.

Do you smell anything?