My main group is out DPS'ing my main group +12 extra toons is what I am reading from the gamparse file. I attacked with main group for 10 minutes, then attacked with the same group and 12 extra toons and after 10 minutes had less total output. the only difference is that i buffed all 3 groups with Vamp Thunder tho idt that has any correlation to the problem.
What is your groups' composition? If using magic based procs/spells (paladins, zerks, etc), that could attribute a decent bit to the total. AVT is ~125% spell damage increase (or base damage * 2.25). If you had UCv1 and AVT, that would be total of 425% spell damage increase (or base damage * 5.25). So ...yeah AVT with UCv1 would be nearly 43% increase.
Based on the numbers you gave, you are missing ~35% dps.
-Hate