Whenever I work with a client who is having problems with self-sabotage -- such as a psychological ceiling, a lot of fear, procrastination, perfectionism, etc. -- I always know that the problem is NEVER what the client thinks it is.
Usually, I run through a check list of things such as:

1) Does the client understand Tharp fundamentals?
2) Does the client have a business plan?
3) Does the client have a decent system, with an acceptable expectancy?
4) Does the client have a have emotional reactions?
5) Does the client follow the ten tasks of trading?
6) Any trading trauma?

And the list goes on and on. And for some people, I need to check everything.

My experience always is that something like not executing trades properly is the result of some emotional trauma that usually happened in the first five years of life. And most of the time the client has totally forgotten about it. But when the experience is relieved of its charge, then he or she can do the things necessary to correct the problem.