@Ryan Cleary
Lenders typically want to see that you are upgrading your primary residence if you are moving around in the same area each year. This is to prevent you from using low down payment loan programs to acquire rental properties, even though the intention is to occupy it for a year. Either way, there is usually a way to justify a move to an underwriter.
As you scale, debt to income should be LESS of an issue if you are playing the game right. You can use departing primary income to offset the mortgage payment so you should not need to qualify for both the old and new mortgage. Once your rentals are reporting on your schedule E, you should be showing net positive income (not including depreciation which is added back) and you can use that income to qualify for more down the road. No one wants to pay taxes but everyone wants to keep buying properties and remain bankable. Pick your poison and decide what is more important to you, I would rather pay taxes and continue to buy real estate.
