Fico while they will look these are not credit score driven loans like those buying rental houses or houses to live in...

I am under contract to buy and flip a house that I am paying $615K for. 

You do realize how you got the house right?

@Armando Carrera as others said above that’s mortgage fraud and not at all what an FHA loan is for.

So I'm strongly considering adding a handful of these to my buy & hold portfolio.I understand that there's no "risk-free" method to acquiring these properties subto, but have any of you had success over the long-term acquiring properties with VA loans attached?

It’s a single family house that I bought for $160k.

I started by house hacking a 4-plex, using a 3.5% down FHA loan and later refinancing at 2.9%.

You have to dig a little deeper there are questions that need to be addressed and VOE's filled out with specifics in order to use certain incomes and "stipends".Similar to a traveling nurse who get housing, meals, and other income. 

The other question I have is if anyone has tried this on repeat, like with standard house hacking (live in for a year and repeat). 

A great way to start is by learning how to analyze deals and exploring strategies like buy-and-hold or house hacking.