Hi LMN.
Maybe a sort of mix between the negative and the positive is the way to go.
I once read a book by a psychiatrist who was in a German prison camp for a long time.
He developed a system he called "paradoxical intention" whereby the opposite tended to negate what would be expected. For example a person giving a speech would will their heart to beat faster and in doing so, it would slow down.
Interesting! I think a PMA, while O.K. can be over rated and there is certainly a place for non expectations etc.............