A random but interesting tip that you might like to try.
One issue with Skritter is that it offers slightly too much of a hint whilst practicing characters. Those of you who've used Skritter for a long time and are honest will know exactly what I'm talking about.
Raw squigs mode removes this issue but also removes the high-speed fun of Skritter.
One thing I do (some of the time) is actually close my eyes whilst doing writing prompts in normal, non-raw squigs mode. My rule is that the character has to be marked correct by Skritter when I open my eyes again.
This ensures I'm actually entirely recalling the character from memory and not getting any hints about how to continue writing it from Skritter.
Just thought I'd throw that out there.