Too thick? Add a little more milk when you respin. Don't forge the respin step - it's important.
Too soft? Use slightly less milk or freeze longer. Be sure to freeze the full 24 hours. It makes a difference.
Different milks behave differently, so start with 10–12 oz and adjust as needed.
TIP:
Prior to spinning: Let the pint sit out for ~30 minutes or run it under hot water for ~20 seconds to loosen up the bottom and edges. You don't have to do this but it usually helps.