I know the pain of not having that damage upgrade. I'm about to master the base cactus, but before I got to elite level 5, it was a pain getting vanquishes trying to crit something five times. That extra three damage makes all the difference.
The only question is are we ok with the Camo being able to three shot an all-star instead of having to use more than half her clip size. Definitely something to consider when zombies have two 200HP variants and MECHs on their side. This is why I believe the Zen Cactus should have been left alone.