It appears this may have been nerfed? I did not do extensive testing but had 2 DC pets in plane of mischief. Teence and Not Poddle Pop, both conned blue. The PC doing damage is a 60 warrior with ambidexterity SOD and BoC. Like I said. Did not do extensive testing, but there should be no way any of those DC pets was able to hit 50% damage with that warrior hitting. I was getting 1% aa per mob with 4 in group on the level 55 halflings in the theatre. I thought something must have been wrong. I dropped DC pets, killed 1 and charmed as normal. Started killing as normal and then started getting 2% per aa on the halflings without issue, one gave a 3% hit. It would appear the DC mobs no longer act as a single unit with regards to having to get 50% damage to suck up the xp, but now seem to be combined?
Experience logic has not been changed in over a year. Cavedude implemented the dire charm stuff years go. DC pet damage was always combined.