I make a quick hack to the code to simulate both demonology talent changes (
code diff)
And i ran T2H demo profile using ptr=0 and ptr=1, then summarized contributions by source to build the following table :
T12H 4.2 PTR Delta
Warlock 23893 26060 9.07%
Felguard 1167 1276 9.34%
Felhunter 9520 10231 7.47%
Doomguard 2939 1851 -37.02%
Total w/ DG 37519 39418 5.06%
Total w/o DG 34580 37567 8.64%
And that let me to think that maybe the Demonic Knowledge change is a little bit overtuned if they just wanted to compensate DG fix (losing ~1100 from doomguard, gaining 110+700 from felguard+felhunter would lead to a 300dps loss only counting Master Demonologist change)