Furthermore, I have an additionally factor of safety of 1.4-1.6 which means I say it's capable of only 70% of what it's actually capable of.  

The loan amount will typically be determined by appraisal (LTV - loan to value ratio) - but your qualification will also be based on other metrics like you mentioned - DSCR ratio, FICO and some other factors. 

I was shown about a handful of their holdings in the Houston, Memphis, and Little Rock markets, but the cash flow and CoC returns were less than $100 per month and 2-4% after factoring in additional expenses like 7% vacancy and 10% maintenance per month to go along with 20% down and conventional mortgage.

Use the following as a "Factor" for discussion and not as exact. 

My experience indicates that solid due diligence upfront on the economics is the critical factor, the tax aspects often take care of themselves with only modest planning.

Bigger Pockets is a great place to learn and connect with fellow investors.What was the key factor that helped you make the decision to invest OOS? 

If the house is listed as-is, there won’t be much room for negotiation (ie. seller concessions/credits), but you can offer a price that factors in the rehab components.

The critical factor is whether the property owner can demonstrate that the sale or settlement was made under the threat or imminence of condemnation.

It's going to be different for everyone based on their skill set, property, renters, and other factors.

Anything smaller may not attract larger investors or offer the economies of scale needed for profitability.Design Style: BTR developments often consist of attached townhomes, usually with features like garages and a more upscale design to appeal to renters looking for something between an apartment and a single-family home.Location Factors: The success of your development depends heavily on location.