If the level 19 NT bought equipment and built wisely, he could have 75-85 strength.
Strength: 81.25 Blocking:
66.62IMO, that seems low for a level 25.
From the state of the game address thread:
http://goallineblitz.com/game/forum_thread.pl?thread_id=630838A good number of formulas have been adjusted to require some more support attributes to work out as well. These include catching,
blocking, and breaking blocks, among various other things.
He did say that he would make adjustments so that a build like yours would be alot better at run blocking but weaker at pass blocking due to the difference in numbers, whereas a guy with 66 Strength and 81 Blocking would be weaker at run blocking but better at pass blocking.
It's also possible that you were unlucky with random number generator today.