I am not sure how you do it, but I need to repeat the character a few times until it sticks.
I wonder if for the initial learning, it might make sense to let you repeat the item x times (according to settings) in a row before moving on.
Right now I always delete with the eraser and draw again until it sticks (works but takes some additional clicks).
Nick asked me to post here to see more opinions on the idea.
So your call,
Alex