Unless the recently changed how seduction works its not worth the effort its to short and as yeh noticed yer pets get beat up quick like.

Why don't yeh have 3 voidwalkers out, offtanking, they at least can survive a few more hits.
Or 2 and a imp out for the health buff. Just have yer pets on one target that way they can keep one busy and if they die oh well there fodder anyways

If yer tank cant take the beating then yeh need to work on yer tanking gear some more or maybe the healing gear or a lil of both?