That said, I believe they can also be instructive, and helpful as I plan to  take them back to the engineering and customer support teams for review. 

I was wondering if anyone had and knowledge of the quality of instruction provided by Todd Dotson of the company Tactical Real Estate.

He isn’t reasonable and Given you did all that I would go formal and hard:Notice on the door reiterating timelines and say you have issued instructions for contractors to stay within those limits and saying you have gotten reports of hostile action from him/tenants Say any further incidents will result in immediate consequences including up to an including reporting to law enforcement (restraining order?)

There's what you can control: checking your existing lease to see if terms regarding plumbing maintenance are spelled out, adding something specific if it isn't there, showing the tenants how to fix this themselves, removing the disposal (this is what I and my PMs always do; not worth the hassle), instructing the tenants that future clogs will be there responsibility personally and financially.

I have a separate appliance lease form for these to call out exactly what we are providing and what we expect from the tenants - I spell out that we only repair/replace if they are used according to mfg instructions.

If you can give them written instructions in Spanish, that would be helpful, if you don't speak Spanish. 

I, too, took the RE licensing class (in 2002) but per the company attorney, I was instructed to NOT take the final because my focus was for company acquisitions, not general public brokerage.

The course is easy to understand, it has good instructions and paperwork.

Christians are to love others, but that nowhere are we instructed to work hard to support our families and then let someone walk in and take things from us.

I would have given them a specific move-date and written instructions on what that process looks like, including the need for them to pay rent and that their deposit would be returned according to the lease/law.2.