I meant to post back here after I took my Focus back in for servicing. Unfortunately, my issues were not resolved and I left the dealer feeling like no one believed the problems that I had been experiencing (engine shudders or hesitates - air conditioner fan blows inconsistently). Once again, the service manager tells me that it's driving like this because it's a 4 cylinder. I have owned and driven MANY 4 cylinder cars and I have never experienced anything like this before. I drive roughly 500 miles a week but I just couldn't handle driving this car any longer. I traded it in on a 2012 Kia Optima SX this past weekend and I am not having any issues with this 4 cylinder car and the air conditioner.
I really, really wanted to love my Focus and I know that I lost a pile of money by trading it in, but I couldn't justify driving something that made me so unhappy.
Good luck everyone!