Figured this to be the best place for this...
Here is an article about a very motivated young private and his APFT score. Notice how his training technique also incorporates building his Posterior Delts. Weak P Delts can contribute to the plateau-ing of Bench Press and Push-up ability.
here
Here's the funny part, you think his score is good check this out.
5min Push-up World Record = 441
What would that score on the extended APFT?
link
Scimitar