With your current settings, Rachio will want to apply 1.02" of water each time (0.17" x 12 x 0.5). Your Crop Evapotranspiration values seem reasonable (set by Rachio, but dependent upon your Crop Coefficient), although they do vary a vast amount - from 0.4 to 0.15 per day, which seems like a large variation, but it’s based on the weather and a formula. You must have just gotten over a really hot, dry spell, and it’s a bit cooler now. Based on the total CE of 1.75", Rachio’s saying it expects you to require 1.75" of water per week, so it should water 1.02" every 1.02 / 1.75 x 7 = 4 days. Less often if it stays cool, more often if it heats up again.
Now, you have no ground cover in your garden; adding some would help it from drying out so quickly. Also, while you have calculated the area watered correctly, watering just two strips in a completely dry lawn will result in a lot of the water leaching out into adjacent dry areas. So, I think you’re going to have to water more, total, because of that.
Now, as to the 1.02" calculated above, this assumes a root depth of 12". This means that Rachio intends for the top 12" of your soil to be completely saturated when “full”, and the 50% Allowed Depletion means you’re going to allow it to dry up down to half that distance, or 6", before watering again. Especially with your exposed soil and plants, I think that’s too severe.
First, I’d water several days in a row to make sure you have in fact watered down to the roots, 12" deep. Then you’re starting with a “full tank” of water. Secondly, I think drying out the top 6" is way too much. I’d set the Allowed Depletion to 25%, meaning the top 3" will dry out (not completely dry, but have much less water). That will do two things: 1) Water half as much each time it waters (0.51" instead of 1.02"), and 2) Water twice as often. This should keep the roots damp (because you filled it up initially) and not let the surface dry out too much. Total water used will be about the same, but will vary, with Flex Daily, depending on the actual temperature and humidity, etc.
You probably know more about your plants that you have in there: do the roots really go, or do you want them to go, as deep as 12"? If so, great. If you never expect them to go that deep, you can reduce that value in the Root Depth setting. If you decrease the Root Depth, you probably will want to go back to 50% Allowed Depletion, ending up close to above in amount of water each time.
Due to the dry rows on either side, I think I’d start by watering about 50% extra, so it can leach into those areas and not dry out too quickly. It may need to even be longer. You’d think you’d just change your square feet, but that doesn’t change how much water Rachio thinks is being applied. I’d say increase your Crop Coefficient by 50%, which is a large amount, to maybe 1.25. That is the figure you’ll use to balance the total water your plants receive over time. If they still get too little, increase it. If they’re staying too damp, decrease it. Your Nozzle Inches per Hour is really high, but very probably correct given your custom irrigation setup, and your measured it, so I’d leave that alone, and compensate for extra water using the CC instead.
Those are my initial thoughts, anyhow. As your plants are way too dry now, soak them for a couple days until they won’t take any more, then work back from there, trying the above. Hope this helps.