For example, Harris & Tarrant county are very aggressive and have many tactics to determine the purchase price of a property even if non-disclosed. 

I don't know who I have more pity for - the new wholesalers who are not going to make any money and quit, or the new house flipper who is going to lose their a$$ on the "deal" they get jammed into with the boiler room sales tactics. 

Best tactic is;  Have good liability insurance and an umbrella, keep the houses repaired well, be quick to fix things, be a good landlord. 

Otherwise these tactics the contractor is using would never work, and he would never use them.

Sometimes they use this as a sales tactic - hoping that you're too invested to back out.I would speak to an attorney or back out. 

I do a little of all of these tactics but telemarketing ROI is the highest and I can see why a lot of investors are jumping on the bandwagon.

What are some current ideas or tactics that you are coming up with?

This is a common insurance tactic: low quotes for year 1, then 10-20% yearly rate hikes thereafter.Taxes....again this seems low.  

Apparently it is a tactic by the lenders to discourage a rush to refinance.

Whether we’re looking at properties, cold-calling, deploying new marketing tactics to generate leads, underwriting deals, or having the ability to watch the morning shows without rushing through our normal routines, one thing is certain.