honestly, i think you're putting a little too much faith in rending, especially to take down nasty things like wraithlords and 'fexes...
i'd make sure to give the champs power fists. yes it's predictable, but it's also very effective and it means you'll always have the tools to deal with any opponent...
either that or grab some melta bombs to handle dreads...
i'd also consider flying possessed (maybe go for 2 units instead of 3) to give you some speed... yes they'll die in all likelyhood, but they'll be able to tie-up some units, and fudge around lines of sight thereby allowing you to get your much more resiliant troops into fire-fight range with even more numbers!
cheers!
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"Who are you to question my methods?! A 'Puritan' is simply a coward who hides behind a veil of pretended faith and denounces his loyal brother as a traitor out of simple jealousy!"
- Inquisitor Odion |