If you have any lenders for HELOC please let me know 😊 Also, another point Lower mentioned was they provide $0 closing costs on future refis as a customer. 

I have never used 1800Accountant, but I have successfully converted their former customers to my practice.They are incredibly expensive, my clients were never sure about what was going on, and they unnecessarily complicated reporting and transaction in order to (in my opinion) make it seem like the clients were getting value for their money.  

If you hire a big name brand builder you main have to pay more on overhead (project manager, superintendent, heavy equipment and machines) and their profit versus if you hire a small builder, the overhead could be almost nothing, and lastly, if you are a good investor/customer, you maybe able to get a better deal (a builder is willing to build the house for less profit).

Personally we can start before the 6 month date but I have heard multiple customers tell me other lenders have said they cannot start the application until the 6 month date. 

I agree with everything that's been said but I'll highlight probably the most important aspect an investor-focused agent will bring is the network and relationships.

It’s about building an actual business with your own customer base (and not what you lease from OTAs).

My recommendation is to figure out what's most important to you as a customer.

I highlight weather and wages but am not as comprehensive as to what I think your getting at. 

This is going to sound sacrilege but I think you should get a W-2 job in real estate based on your end game of wanting to be a developer I would look to work for developers, custom builders, surveyors etc.

You can always leave a packet and highlight your property details and the comps you believe are stronger than others.