TFO; if you believe that strongly in your logic, you need to get it accepted on the site first before trying to apply it on your own.
Please reread these lines:
1) Striking Strength is the output of energy a character has, and due to Newton's Laws they must be capable of withstanding the amount of energy they're unleashing otherwise they would hurt themselves. Therefore you can scale a character's Durability to their Striking Strength.
2) If a character hurts themselves when attacking (punching so hard their fist or their arm shatters), then their Striking Strength has surpassed their durability. Therefore you cannot scale their Durability to their Striking Strength.
3) If a character can tank a certain amount of damage, you have their Durability. For example, if All Might withstood a City level bomb at point-blank range, then we could rate his Durability at City level. However Newton's Laws don't work the other way around; getting a character's Durability tells you nothing about their Striking Strength. Therefore even though we could rate All Might's Durability as City level because of his earlier bomb feat, we can't rate his Striking Strength at City level.
Is there any flaw in them?