There are a lot of Flex power users from the Phoenix area on this forum @jeremysm1, so I’m sure we can help get you dialed in better. First of all, where did you get the AW of 0.08? I’m not sure that’s the issue, but it’s a good starting point. If you could also post screen shots of the zones that you have in question, including ‘advanced settings’, we can get going.
And regarding your shrubs, if you haven’t already done so, take a look at this post and report back how close you think you have been to the associated recommendations.