Not really a surprise that you got a deed from Ix'Aern, since DRG and DRK always either drop that or a Vice. The only Ix'Aern that doesn't drop something 100% of the time is Ix'MNK, and even that drop rate you can control if you want.
So basically you've had a run of good luck on jailers. They can be generous at times, and they can suck at times, doesn't mean SE changed the game. I think our drop rate on Virtues is around 75-80%, but part of that is just doing things right. But like I said, they didn't change anything, you've had good luck.