I expected more - am I wrong?
Yeah, most of us would know what that is. Finger tight is not as tight as you can possibly tighten them. It's about when your fingers start feeling resistance and the torque needed shifts from nearly nothing to really something. That range is about 1/8th of a turn. Anywhere in there is fine. Get there and add 1/4 turn.
However, if you are worried, mayhaps what you should rely on is not the pressure but Loctite.
Add some to the end that attaches to the driver. You’ll get a permanent lock that won’t strip the screws. If you ever need to remove it, you can, but vibration won't cause them to loosen again.