My plan is to buy my first investment property in about 18 months and i'm trying to get my credit score as high as possible during this time. 

Of course there is a minimum credit score for the applicant but it sound to me too good to be true.

Other positive effects of choosing this path - my credit score jumped from 650 to over 800 and my net worth is close to $1m (totally on paper, at least for now!).  

And thats one of my earlier houses that is a lesser home.Most of my stuff is 130k to 150k.

As a forgeiner your forgein credit score means nothing here, and they are hesitant to lend to non japanese.  

(I know Maryland, DC and Virginia will).To quote from NAR "Discussions about schools can raise questions about steering if there is a correlation between the quality of the schools and neighborhood racial composition--or if characterizations such as “a school with low test scores” or “a community with declining schools” become code words for racial or other differences in the community.

My trust in people degraded as my perfect for 10 years credit score went down and my never holding debt on a card or paying interest to a credit card company for 10 years when up and nearly bankrupted me over the past year.      

My business partner and I have a portfolio of properties we own in NW Indiana, primarily in Hammond and Whiting, with some lesser exposure in Munster, Highland & Schererville.

If you willingly go forward to the sellers and offer references, credit scores, bank statements, etc then they may just take you at your word. 

Most are smaller and lesser quality than what we offer.