I'm also really enjoying this deck and especially the Silas+Octosari combo. But I do share your thoughts that it's not quite optimized yet. Preparation has been a dead card more often than not for me, and I'm also uncertain about playing Lab Recruiter on curve if that's my only choice. I'm thinking if a little early survivablity wouldn't be helpful, maybe a Flesheating Ghoul, and Evasion, as you suggest, also seems like a good idea. Have you made any changes since  posting?