My son actually has a checklist that he usually follows (it is actually fairly short--consisting of three steps). His mental lapses are due to the occasional times that he completely forgets to perform the checklist.
Is he allowed to write the checklist in his fingers during the match?
If not, write the checklist on the fingers outside the match so that he comes to associate each finger with each step.
Did you read Josh Waitzkin's 'The Art of Learning?'
I read most of it and would be interested in your thoughts on it.
Welcome!
Grinity