Credit Score: 

With regard to my parents, I want a good relationship with them so they can build my credit history.

One suggestion to consider as I mainly do BRRRRs as well- find a local bank or credit union in the area you plan to buy that offers construction loans.

Incidentally, I cancelled last year when it auto renewed as well - I guess I've got to completely delete my profile and close the attached credit card for a cancellation to stick?

Local credit union.

I had belatedly realized that FHA goes off personal credit and therefore I couldn't use the LLC for it.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

They offered to give me a credit on a future loan.

Most of our newer investors approach 2-3 lenders to discuss loan options.Some lenders recommend making your financing inquiries within a 45-day time period to avoid larger drops in your credit scores.All the best!

You are right, when the inspector mentioned the possibility or prior water damage is when you should of had that basement inspected by a contractor/professional and not listen to your agent.Gregg is right, the sellers were aware of some of the damage which is why they gave you a 5K credit.