Just to add some rough numbers, the last time I parsed Pelk (Mage, donor bp, donor pet focus aug, donor weapon (utilizing both donor buffs), fully rk2 buffed, elemental fury, donor + deathbringer auras &glad/lion rk3 and rk2 weps) she was at ~180-200k dps, with Druid bp that was up to around 230k iirc possibly slightly higher.
The parse of my own Mage, Spellfire (rk 3 pet with rk2 weps, donor weapon buffs (both), dark minion, fully rk2 buffed, ele fury, donor/deathbringer aura and glad/lion rk3) she was doing around 60k dps iirc. Didn't get a figure with Druid donor bp.
This is already a massive gap, which personally I was happy with because pelk has had a lot of money spent on her. Now with these nerfs (I know, they're due a retune), Spellfires pet was at 19.7k dps without glad/lion but with rk3 pet weps.
I will log on in a bit and run the same test as pre nerd but I doubt I'll see 30k tbh.
Again, I know this is due a retune but I must admit I'm airing on the side of a comment that was posted earlier about this nerf possibly should have been tested on test server first. Something like this, I guarantee people would flock there to give you numbers so we didn't suffer so extremely.
I have no issues with a nerf as t8 pets ARE OP for lower tiers but in t8 I don't feel they are and that is with multiple bots in my crew pushing out 200k+ dps. I just feel an exact nerf would have been better rather than a changin nerf that has pushed a lot of people's noses out of joint slightly.
EDIT: I forgot to mention that Rk3 Enchanter debuffs were used on the T1 dummy too.