As Snowjobs mentioned earlier, it's better to see some numbers to get an idea on how skewed the numbers actually are between the mobs and on other players, or with those and wowhead numbers.
As for vague, general, possible explanations (though certainly not exhaustive):
*Skewed, as in the damage dealt to same-level mobs and same-level twinks are different, or just inconsistent with wowhead's numbers?
*Crits against players deal 1.5x instead of 2x, while crits in PvE still deal 2x. Was that considered?
*Some classes may have passive sources of mitigation, most notably warriors with def stance as one example. Also considered?
*Those other twinks have some grandfathered resistance enchants equipped during the checks?
*Perhaps wowhead's numbers aren't accurate with current beta for that level?
Mob damage and Player damage were never considered on the same platform, yet similar damage deficiencies occured when using the abilites on both. The new crit was considered, all twinks were checked for resistance gear, and I only tested on a pally, warlock, hunter, and fellow priest. To my knowledge none of those classes have a noteable passive defensive against spell damage (none also had shadow resist racial). I was mostly fishing here to see if anyone else had been testing wowhead's numbers and had found them to greatly differ with whatever napkin math they had done. I am now simply drawing the conclusion that while wowhead's new warlords tooltips for abilites (at least as spriest) may look the same the difference in projected damage vs actual damage just means that the latter is true and their numbers are not reflective of the current beta for that level.
The numbers themselves dont matter, which is why I found no need to add them in the post. The percentages do, and excuse my lapse in not adding them at all. Wowhead projects roughly 25.6% more damage from Mind Blast, than I seem to be getting on beta. Wowhead projects 14.85% more damage from Devouring Plague than im getting on beta atm.
So the difference isnt HUGE, but seems to be significant enough for me to be a little peeved when I try to do napkin math, get excited over what the projected numbers are, cross-check my math with wowheads, get the same number, get even more excited, and then go and actually test the abilites out and find them at a deficit.
So now my question is, is anyone else having the same thing show up? For example are you on your arms looking at rend numbers and find it to be in live at a deficit of 10%+? Because at max level testing, projected numbers for these spriest abilites are IDENTICAL to wowheads numbers, the error in them is incredibly low and wowheads projected are quite accurate.
Is it just a level thing?
Side note: What devouring plague numbers theoretically should be:
276.8 shadow spell power.
So on a 3 orb, thats 276.8x3
+ 276.8x3 (the tick part after the initial blast) = 1,660.8 base. Thats with no procs or buffs on, and no crits on anything.
Healed for 100% of damage dealt, +1660.8 health.
Those are what wowhead says should be the numbers.
What I get for my non crit Dplague against twink, is a Dplague adding around 1,414 plus or minus 1 damage of for error.
Thats 14.85% damage lost to the wind.