With reserves taken care of, what you need to keep your eye on is debt to income ratio. 

No move you make in real estate will make as much of an impact as paying that off.

More details on my personal approach from syndicatio standpoint is in my article: https://www.biggerpockets.com/blogs/10850/75569-care-for-your-investors-like-mom-cares-for-you

As far as they are concerned, the SDIRA is invested in shares of an LLC.

I been researching myself the answer to this dilemma - here are some other threads that you should read to gain insight in the various pros and cons of an approach versus the other.74999-paying-off-rentals-early568352-pros-cons-to-paying-off-rental-property-early547169-how-leveraged-are-you527382-pay-off-mortgage-and-snowball521188-pay-off-one-property-or-look-at-another74999-paying-off-rentals-early529189-payoff-mortgages-or-notShould You Pay Off Your Rental Properties Quickly?

Also I invest out of state so I like knowing everything outside of the unit is taken care of and the tenant doesn't have to deal with landscaping or watering.  

Be careful when people tell you that it's not possible.

@JD Martin that makes sense and these folks had owned a home previously and from what i've seen have taken pretty immaculate care of my home. 

I personally want to see that people are taking care of the properties.

These expenses are including, utilities if you pay for them, maintenance, yard care, pest control, insurance, advertising, property manager etc etc.these often come up to well over $3000 per door - depending on the market..$750. sounds to low for all expenses.