i know my weaknesses vs i know my deficiencies

Some examples from the web:

• It seems you know my weaknesses better than I do myself.
• But do not try to defeat me, for I have been testing you and I know your weaknesses.
• I know all your weaknesses now, cy.
• I know his strengths and I know his weaknesses.
• Well, to apply pressure on a man for this type of work you have to know his weaknesses and I know this man's weaknesses intimately.
• But I also know his weaknesses.
• Now, we know our weaknesses.
• He probably already knows your strengths and weaknesses.
• Why should I need to know his weaknesses?
• So Judge Harper saw firsthand what happens when your competitors know your weaknesses and your medical history.
• Lets the other person know your specific weaknesses.
• And you know where his weaknesses lie.
• Milosevic knows our weaknesses, but he does not know how determined we are.
• It is always a strength to know the weaknesses of your friends,
• You've got to set your aim on your prey, know their weaknesses, then... dah, hunt them down.
• However, we all know the weaknesses in the Union's external action: lack of visibility, inadequate coordination on occasions, flexibility which leaves much to be desired, too little influence in international institutions, especially Bretton Woods.
• Any groups that have specialised in fraud would of course know the weaknesses of our system and also how to hide their cheating by staggering the four flows into a favourable chronological sequence.
• He knows everything: Our weaknesses, including this place.
• It's kind of a long story, sir and I know that's one of my weaknesses, telling long stories and rambling so...
• We all know about Europe's weaknesses: demographics, lack of future expenditure, industrial challenges, government deficit, weak economic governance.

Some examples from the web:

• Well at least now we know what Transformation Dopamine Deficiency is.
• There are quite a number of deficiencies - we know this from the surveys - when it comes to information, cooperation between Member States and the ability to carry out checks.
• I don't know what personality deficiency causes you to act this way, but I feel compelled to inform you how utterly unattractive it makes you.
• That applies especially to attacks on women and girls and to the deficiencies we know existed in devising and implementing the war crimes tribunals in connection with Rwanda and Yugoslavia in the 1990s.
• I know my presentation was a bit...
• I know my father's voice better than I know my own.
• I know my city and I know my state.
• I know my predecessor wasn't gentle. I know he hurt you, Jess.
• I think I know my sister pretty well.
• Look, I know my mom...
• But now I know my son's.
• Okay, I know my rights, man.
• Look, I know my rights.
• But I know my way around this town better than any cop.
• I'm so glad I know my character.
• I know my way around a racket.
• It doesn't matter anyway. I know my responsibility.
• Please? I know my son.
• Carol, I know my actions have upset you.
• Because I'm a man and I know my flowers.