I know how to beat your list Chris, I've played you 4 times and not lost yet. Regardless of armor saves you still are almost NEVER going to charge that unit where it can stand & shoot unless you have been able to whittle it down with your own shooting/magic, or unless want to lose your rear. Further, it preserves points because since you don't want to charge that, and your 315 point iron demon is nigh-unkillable, your list does exactly what a deathstar list does ... preserves points. Deathstars aren't just about killing things, it's about making it near impossible to get points off your list without massive risk.