Incentive of some sort for tenants who constantly pay their rent on time or are the "ideal" tenant?

This along with your investment time frame are key factors to consider.

You also are only Cash Flowing less than $100 per unit.The ideal BRRRR deal would end with Zero of your cash left in it.  

Ideally personally I’d keep my overall portfolio at 35-40 percent equity.

But it depends on different factors and not just credit score either.    

Timing isn't ideal - at least in Minnesota - but I figure real estate is just like any other industry: regardless of market conditions there is always money to be made if you're creative, have a plan and the right strategy.My business partner and I have the creativity part down but the plan and strategy are items that we're working on.

But doing our part to be extra careful and getting the structural and soil surveys done to factor in the additional costs (if any) as well. 

That is a broad question and based on many factors on both the property and the market. 

@Kendrick Smith - You also have to factor in closing costs on the refi.

The deadline is very strict, and the custodian must receive the money by the deadline.If it's anything other than A or B - there could be some important complications.Once you acquire the property, ideally you should limit your personal use to no more than the greater of: 14 days, or10% of the total days you rent it to others at a fair rental price.If you exceed this number, your tax deductions will be limited.And when I say "personal use" it does not mean just you.