You are exactly right. It is just like last years game. Almost let the cpu get comfortable back there looking for a few seconds... and bam!
Thats why I just gave myself a slight boost to pass rush, to the cpu default pass block. I fear if it is too much of a boost the cpu will unload fast every pass. Just enough that my guys can get by(60), without getting pancaked.
And I do blitz, but not too often or else again they will unload it in a second.