I just want to say, thank you for making the difficulty levels of the new missions not just an increase in the CR of creatures, but extra monsters to make it more challenging. I love that direction and hope you continue in that vein. This would be especially great in undead quests to make turn undead more viable by the way.. which I'm sure you've thought of, lol.. Anyway, I love it, adds a little bit to the mission replay value.
I'd like to see this mechanic for traps as well, so that it's not necessarily DC's going up, but that there are more traps in more random places :P