Looking for a complete list of how the 37 factors are balanced The 37 Factors are sometimes paired as balancing factors. When they are out of balance there are some implications, and there is a controlling (or pivotal) factor which is instrumental in keeping the balance.

In many publications these are scattered throughout, so I am looking for:


balancing factors, or pair of factors which need to be balanced
the implications of any imbalance
associated Controlling (or Pivotal) Factors


... with references from the Canon where these appear.
This PDF could be a useful resource, specifically the following passages:


  faith and wisdom are to be balanced
  so as to avoid blind belief and mere intellectual cleverness;
  effort and concentration are to be balanced
  to avoid mental restlessness and sluggishness.
  
  Mindfulness is the key factor that keeps all the other
  factors in balance and harmony


and 


  The three factors of investigation (dhamma,vicaya), effort (viriya) and zest (piti) counteract torpor.
  
  The three factors of tranquillity (passaddhi), concentration (samādhi) and equanimity (upekkhā)
  counteract mental agitation. 
  
  Mindfulness (sati) keeps the two sets of factors in a harmonious balance.


Other than these areas I could find no references to balancing the 37 factors. Hopefully this is what you are looking for...