How can I remember Silman's imbalances? I can never remember Silman's imbalances when it comes time for a tournament. I can remember them any other time when I'm not all stressed out. Is there any way that I can?
At the moment you are trying to remember the imbalances using declarative memory:


  Declarative memory (“knowing what”) is memory of facts and events.


Whereas you need to have the imbalances in procedural memory:


  Procedural memory is a part of the long-term memory that is responsible for knowing how to do things, also known as motor skills.


So you need to internalise the imbalances by practicing, for example using the The Reassess Your Chess Workbook by I.M. Jeremy Silman.