Once stable then try to sell off or refi at the improved value.No legal advice given. 

It seems to me that my GF and I have the high credit score, low debt-to-income ratio, decent down payment and good stable jobs.

Like @Ahmad Hijazi said, my W-2 has really helped me finance my first few properties as its more stable initially than starting out in REI without a steady income stream.

Taken straight from Freddie's guide book:     4501.9: Borrower income and qualifying ratios for Home Possible® Mortgages (07/11/16) (a) Rental income from 1-unit Primary Residence Rental income from a 1-unit Primary Residence may be considered as stable monthly income (as defined in Section 5301.1) provided it meets the requirements in Section 5306.1 or the following: ■ Connection with Borrower.

I am a novice investor but have a strong, stable income and very little debt.

This will provide some evidence by next year if there is still movement or that the soil has become virtually stable.3.

The really expensive homes lost some value (which has fully recovered) but the median home value has been stable.

SOOO....Lesson to investors Mid-market is much safer, not as risky, and tend to be stable.  

The answers to these questions will guide you to invest in single family or multifamily, lower or upper middle class areas, stable or transitioning areas, and rentals or flips. 

@Josue Vargas Income is stable and good for my line of work, but it's not going to wow anyone.