what you quoted are irrelevant numbers that do not correlate in aircraft configuration, the only correlation is that they come from the same manual. But the qouted stallspeed is in clean configuration, not the required take-off configuration.
Please provide some correlating numbers. Instead talking about how they are too complicated.
I showed numbers from the performance section of the minibus. Although they are certainly not exact, it does not show the massively comfortable margins you claim.