MadAdey
Money List Winner
My impression is that softer balls stay in contact with the club face for a little bit longer, so have more time to pick up spin.
I think there lies your problem. You are looking at things old school. Modern balls can be firm now and spin higher than a softer ball that is designed to spin less but not feel like a brick.
When I started playing if you wanted spin then you got a soft ball like a Titleist Professional or Tour Balata, both very soft feeling balls. Not anymore Del, the spin is now being defined by the varying layers like the TM 5 piece balls. They feel very firm when hit with the driver but soft and spiny with the short irons.