I've played as my Titan recently and haven't noticed a difference. I've always been killed while using the fist of Havok, Unstoppable or no. With unstoppable, it's much harder to die from rockets and shotguns, but not impossible. Even got fusion rifled once. That was a nice change.
I think your just imagining things.
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I need to know this from a Titan's perspective, do you ever get shotgunned from point blank just before you're FoH but survive?