Look at the back of you hand, on each finger you have 3 knuckles. A lot of new players swing the fingers from the first knuckle from the wrist, a habit they may carry on with.
This give a long shallow sweep to the arc, with minimal use of the other 2 knuckles and finger tips at different lengths. This technique means it is harder to get in between the strings as a swing is needed to generate the movement, and the un-even tips means un-even contact..
If you bend from the 2nd knuckle you will see the action is more compact, the swing tighter and narrower. This give more control to play gentle. To get the position hold you hand and fingers together straight then bend from the 2nd knuckle only. Notice now that the end of the fingers are now level so access to the strings is the same for any of the fingers used.
From the 2nd joint to the tips want to have a gentle curl, and from the same joint back to the first knuckle wants to be straight to support this movement in line with the joints used.
