I could buy a LOT of umbrella (additional liability) insurance for $13,000.

This allowed us to maximize revenue and occupancy more effectively.Safely Insurance: We also decided to use Safely Insurance, which provides comprehensive coverage for guest damages, liability, and protection beyond what Airbnb or Vrbo offer.

Taxes and insurance will be another $400+.

For example, we need proof of renters insurance and proof they put electricity in their name.So, it seems odd that you are accepted but they keep wanting more information. 

I follow Dodd Frank, I use an RMLO, I have a title company close the sale and offer title insurance.

You'll want the rents to at least cover the monthly principal, interest, taxes and insurance (and HOA if there is one).

My monthly payments (mortgage, insurance, taxes) are roughly $3,600, leaving me netting about $4,600/month.I have four years left until military retirement, after which I’ll have a pension, some disability income, and rental income from this property.

I'm assuming you are arriving at your cash flow number by applying Gross income - cap ex, maintenance, utilities, vacancy, tax, insurance, mgt, landscape/snow & Debt service?

Insurance companies are always looking for MTR that are furnished like ours  never stays vacant more than a week.

You should allow a 1-2 Weeks for the appraisal, and 1-2 weeks for title and insurance.