Most lawsuits against landlords involve wrongful eviction, security deposit disputes, and Fair Housing Violations.

My experience currently involves but is not limited to; breach of contract, embezzlement, coercion to include extortion and blackmail, and bribery from both lender and two NEW WESTERN agents.

As investors we want to maximize revenue but to your point that still requires applying common sense and basic ethical principles.

Start by being actively involved with your PROPERTY MANAGEMENT duties.  

No agents involved.

That complicates enough I'd consult with an entity/asset protection pro.I don't hold residential assets in LLCs unless partners got involved. 

There are a few options(1)You can get connected with the larger wholesaler firms in the area (2) go through PCPAO site and skiptrace the buyers of similar properties as yours, (3) hunt down the agents involved in the sale of properties similar to yours or go to local REI meetings and pitch it to the investors there. 

The truth is if your investors have no involvement in the operations, If they just put in money and expect to get a profit, you have created a de facto syndication.2) I see a ton of people who just raise money for the syndication. 

The builder offerred $15,000 credit to be applied, however you wished EXCEPT can not be used for price reduction. 

I took what I learned, applied it, made mistakes, and kept going.