I don't think your quantum has centrifugal braking. I had an older energy, and if my memory serves me right, it was finicky to set up. I think I kept mine set on 3 or 4 and let her eat.
If you keep experimenting you will get it down. And to be honest, I don't own or have ever used a baitcaster I didn't have to thumb at all.
Not trying to be mean, but maybe you should stick to spinning tackle or upgrade to a DC reel if you don't want to thumb the spool.