Whether NY decides you are a resident has nothing to do with Iowa declaring you a resident. It is absolutely possible to not be a resident of any state for tuition purposes! Yes, double whammy. If NY says you are not a resident by Aug 2019, they may not allow a change of residency and you might have to wait out a year and start as a freshman/resident in 2020.
It sounds like you are doing everything correctly and will be residents of NY in one year. Have you dad keep dated copies of everything.