As you use SQL Server you use Level 1.
As the data can be different between time A and B I assume it is possible that a bad query behaves different between time A and B, but it sounds weird to me that TT_SQL_TRACE differs between time A and B for the same session. Is it possible to upload the first 100 lines or so of each trace?
BTW: this post has been made on my personal view. My employer might not share my point of view.