I wish them well. 

Some brokers (like this one) work with 220+ lenders.

All have performed well and rent easily.

Well? 

While I don’t know their program or them, I’ve yet to see a mentorship program that cuts the time necessary to obtain the knowledge required; that has a monopoly on any tactic, strategy or technique that’s not common knowledge; and or that provides any ongoing “help” that’s anything but “basic”.If you’re not well versed in principles, finance, and law, either read books on these, attend college classes, or take a course(s) leading to real estate broker (salesman) licensure.  

Ran into many problems with contractors along the way, paid for some material twice as well as some projects to be redone.

For example, if the refi lender requires 6 months of seasoning so that the refi is based on LTV rather than LTC, then your HML will likely be 7 months...

*Soon after, I will be moving to the South, where I will purchase a relatively moderate-priced home (less than $350,000), likely a single-family, possibly a duplex.~ I will most likely purchase the first home (multi-family) using a bridge-DSCR loan combo or a FHA203K (3.5-20% down). 

2) How well do you understand the differences between Class A, B & C?

It has it's own separate entrance as well.