It would appear you are configuring your aircraft for “Before Landing” much too early. A DC-6 at 70K lbs should be travelling at 138 kts on approach, 110 kts vref and then 78 kts touchdown. It takes getting used to because it behaves very different than jet airliners. It’s large straight-wing design allows for low and slow flying which is why it is still in operation in places like Alaska delivering tons of cargo over dirt strips.