I'm not waiting, but I'm my own boss.
I live in LA, like you. I had been contemplating AWD for performance boost, like you. My delivery estimate for the First Production models is a month later than yours. My AWD window is the exact same. I do not own a Tesla.
A few things stand out to me:
1. If I wait and end up paying a 4-digit repair bill on my current car between the time I could've gotten my Model 3 and the time I actually do, I'll be pissed.
2. The "July" early part of that AWD delivery window puts it in Q3. If the Model 3 ramp goes as planned, Tesla will likely hit 200,000 cars sold in the US during Q1 2018. If so, the $7500 tax incentive will be cut in half by Q3. It's possible they delay the delivery of their 200,000th car to Q2, meaning we'd be safe, but considering the AWD model would also be a pricier car, I'd rather not risk it.
3. I've been waiting a long time for this car. I slept outside to reserve mine. I'd be lying if I said part of my excitement for and interest in this car "wasn't" an opportunity to drive it before anyone else does. That extra 9 months of waiting is 9 more months I'LL be the jealous one. No thanks.
The thing I'm most concerned about is whether or not the white interior (supposedly available Fall '17) will be available before my production window is up. I'd be bummed to miss out on AWD AND the white interior, but we'll see how the deck unfolds.