To clarify something regarding the stock dual mass flywheel, it cannot be easily turned. There is a rubber elastomer to allow the surface to catch up to the pressure plate for a smoother action. It also weighs about 32 pounds.
I put a solid e28 m30 flywheel in my '89 535 when I replaced the clutch last year. The single mass, solid flywheels can be turned.
I'd guess that your pressure plate is binding, causing the no release. Maybe the release bearing wasn't seated on the little pedestals, causing a heavy clutch pedal?

Here's the earlier, e28 m30 flywheel: