I would recommend going into the zone settings for your newly sodded zone and cranking down your root zone depth, since your roots are most likely not established to that depth yet. This should increase the frequency of your watering (it will also decrease duration.) I would then create a flex schedule, and see what you think about the projected watering schedule. As time goes on, you can slowly adjust the RZD back out to the appropriate value.
If it stills seems to be too little, or you are still nervous, you can also set up a fixed schedule to run on that zone along side the flex. You can create it to be the absolute bare minimum you would be comfortable with, and allow flex to compensate for the rest. This way, you can see your flex react to the fixed, and give yourself time to get your settings tuned without losing your lawn.
Let me know what you think of those-