I am foreseeing a bit of a push back or even turned-off potentially decent tenants by the $50/pp screening fee, mostly for a family of 4 ($200 out of pocket).I was wondering if offering a credit of either 50% or the full 100% of the screening costs from the first or second month's rent is a good idea.Thought?

I currently reside in Ohio where I buy SFR rentals and do a couple flips a year.

I have 880 credit score, decent savings, and no other debt except for 300K mortgage on my primary residence (worth $1.5 million).

Yes, you are all good. 

I own my current primary residence & have about 140K in equity.

Top 3 reasons owners hire PMCs:1) No time to manage correctly2) No time to learn how to manage correcly: laws, documents, processes, etc.3) They're too nice and need someone to "save them from themselves"A good PMC can usually earn their fees by better managing the property/tenant than the owner, thereby:1) Increasing owners net profit2) Decreasing owner's time commitment, stress, headaches, etc.No matter what though, you should always plan to commit a couple of hours a month to manage your PMC.

I've picked up several really good deals because a tenant operator ran the business into the ground to a point where the property owners just wanted or needed out. 

Maybe also consider if they are "good people" that work in the community and just want a safe place to raise their family. 

My primary residence is an apartment I rent in Brooklyn NY.

In this case my plan is to use a HELOC on my primary residence to purchase the property in Puerto Rico.