I also have the same problem with serviceability, we had found several properties with amazing  CF+  and potential, but  the banks wouldnt service us…..because I also have a large family then 4 children, now I have 5.
I cant stand that they tell you what you can and cant afford I only have a PPOH and 1IP, and now Im stuck and its frustrating seeing all opportunities go by and house prices getting further out of your reach…….so I have been knuckling down paying extra off our PPOH mortgage and doing things around the home that will hopefully give us a bigger valuation, another thing that could give you better serviceability is to earn more per year…LOL, I dont want to sell my IP, its in a bad area and I have a good tenant,
typing this reminds me of how frustrated I am about our limboness!!!
Good on you Daedalus for having a great portfolio!