Okay so for the voidwalker aggro, it's a problem I currently suffer with. I'm running deep afflic on them all for now, until I can get Soul Link at 40 and hopefully the aggro will be a bit better. I have torment on auto-cast. I used to use Suffering on round robin but found it too hectic to continue casting on locks, healing on priest and using that so it's flatline now and I cast across all as soon as they're rounded up. I have /petattack on mousewheel up so I usually just spam that on certain mobs, I guess I'm fortunate the aggro gets divided up.

I did try an eye of kilrogg pull many times, what I struggled with pulling too many elites was a lock would take aggro and just get insta-deleted (even if I used sac) and then I'd struggle to have the dmg to finish the pull off. I might try again at 40 with SL but at the moment I've tried several times and been unable to get around this.

For the debuffs it's a weakaura I got from a streamer called Tribe_tv1, just go to his channel and type !wa or !weakauras or something like that and you'll get it.

I still feel like there's stuff I could be doing better though.