Better Business Bureau reviews, etc.).Can I set up a self-directed Solo 401k if I have full-time job?

Don't trust what ANYONE tells you about a market without solid data to back it up - this includes claims about how many transactions they've done or a single example (that's often from several years ago). 

Some gurus tell practicioners of sub-to to hide transaction from the lender by saying the lender doesn't care as long as the payments are being made.

If it's a QM you won't be able to close in a business entity like a LLC, although in some cases you can transfer into an LLC after closing.

You could simply let them know that your schedule is busy and they need to schedule a time with you in advance. 

Having dual licenses, loan origination and real estate, has got me involved in most parts of the investment transaction.  

Additionally, when comparing whether to build a single family portfolio or a comparable multi-family portfolio, you should also keep in mind the transactional costs involved.

I won’t sugar coat it when I first got in I didn’t realize the over head cost to run a business .

We're probably not going to take the risk if we're busy agents to play that game. 

They must be very low odds because insurance companies are in the business of making money, not paying out maximums.