Hey Tim, I think when you get more used to the dignics you won’t find that it’s too slow at all. I think you can still learn and develop well using a rubber like dignics 09c for sure. Once you get used to the bat angle and acceleration you’ll find you can get plenty of speed from the 09c.
So I’d say of course whatever you feel most comfortable with, but there is no reason not to use 09c right away 🙂