Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Often times when a builder/buyer moves too fast, or is too busy and overlooks a key piece of due diligence, the unethical ones will try the "scorched earth" method and blame everyone but themselves, even when they know it was their own mistake, and they'll see if they can scare you, the seller, the title company et al into paying damages/fixing their problem. 

Your problem is probably your method of wholesaling. 

And there is definitely ways to structure a sub to deal to protect yourself a little better as a buyer but the problem is and will always be that the lender isnt in the loop with this and can call the loan at any point which puts a lot of risk on the sellers willing to do this method and the buyers who are investing money into these deals.

Some of it is due to his questionable methods of getting reviews on Bigger Pockets.

I decided I’d find another method. 

Additionally, are there any other methods, approaches or strategies you’d suggest for someone just starting out in this space?

Sellling you courses or charging money to join their members only group with their tried and true secret method.. the lenders, the insurers, be carful.

Bandit signs, cold calls/texting along with direct mail is the method most people use.

While many gurus glorify the strategies they’re selling through courses or books, methods like out of state investing aren’t easy and can put you in a tough financial spot if you’re not careful.