They aren't licensed or insured.At least a PM is typically licensed and insured.From what I've heard Joshua Tree is very saturated so it sounds like your doing good to break even.Since you seem to be doing everything right and going beyond what many are doing, adding someone else to manage the property will just lower your Net profits from having to pay them.

Anyone having major success with only buying SFH and renting them out to tenants to make good cash flow each month and re-investing?

Louis are good markets, but I think that they’re already saturated with investors. also curious about finding out how many vouchers are ready given out.

Would a virtual assistant be a good option?

But based on the question asked you would be better off asking for help from a good agent. 

I'll throw it out there as an option, knowing that no one is really going to take it.Your proposed transaction is low leverage, so very good terms should be available, but FDRs New Deal in the 1930s (which created the kid-friendly home loan ecosystem -- home loans commonly had 10 year balloon payments before that, even if you put 50% down) was only for homes, not for CRE.

This video helped me, as a business financing newbie, understand what a DSCR is and why it can be a good option for investors.

Once they have lived there 12 months, they can stay as long as they want provided they don't violate the terms of the lease to the point that you can evict them for the violations.So either terminate every lease right at 12 months or pray that you get a good tenant??

Good Luck! 

Very good cash flow and it has definitely appreciated over the year I had it.