I would drop the Parallel Lives for some Dissipates. You're more likely going to want some added countering than the lives. Sure they help you double the token copies, in the same respect, you're sitting on 14 some odd ways to generate/populate those tokens. Having a Dissipate to deal with Sever the Bloodline could be huge.
I would drop 2x Stolen Identity for the reasons you identified. I would slide in two Rootborn Defenses for the countless board-wipe control builds out there (and they offer you two more populate options).
I would, to be honest, drop Clinging Mists - you're sitting on enough damage prevention with Fog and Druid's Deliverance that you're probably going to be pretty safe most of the time. I would even consider dropping the Sleeps as well, as, let's be honest, a well timed Aetherize will be a much heavier blow. On top of that, you can totally lure them in with the Fog effects.
For the SB, I would toss in another 2x Aetherize and 2x Rootborn Defenses (pending you don't mainboard them). Aside from that, the SB strikes me as a place to have some Centaur Healers for use against aggro matchups and a LOT more counter-magic to watch your arse against control matchups.