I was thinking that what Death Guard get for their mark and what 1000 Sons get are backwards. 1000 Sons are ghosts in armour basically, so I think they should get the added toughness because you have to blow the armour to bits to stop them, so added T seems appropriate. And Nurgle should get 2 wounds cause you may get a wound that would normally fell a marine, but since they are already rotten anyways, maybe that wound just blew up some already toasted guts anyways, so you really have to pump some wounds into them to get them to go down. They also should be slow and purposeful, because they're half rotten, kinda dragging along mangled legs and such. I mean how fast can you expect a decomposing body to move? On the other hand why would a ghost be slow? They wouldn't, that's what I'm trying to say.