Ben:
Keep in mind that 99% of the people who will be using this or any of our plans do not have your strength training background and can’t DL 400lbs. Because we do not know how will be using these plans we have to shoot for a safe middle ground. I often tell folks that these plans should be considered the minimum needed to perform well in your chosen event, not the maximum.
In your case, by all means add more volume to your program.
Scott