Diff 7, I thought there was a lot of build up, but it was honestly expected to me. I let them build up, and let them build up over a period of time. If it's not knocked down, it all starts filling carriers left and right.
Imo, seems like the pressure of the game, versus anything that's out of the ordinary.
But I'll get back to you as I play this game; started a 8/8 w/ Spire and Heroics.