That's correct, it is very heavily dependent on the judge assigned to your case and precedent cases don't offer much authority except in the way of obiter dicta because family law is legislated, which is superior to common law.
In my personal matter, our judge was renowned for favouring 50/50 arrangements and was described by one of the lawyers who frequented his courtroom as follows: 'He hates stupid women and he loves self-represented litigants'. Fingers crossed you get one of similar thoughts about fair and equal parenting.