I have some negotiation tactics under my belt but I am hoping to learn about some tactics involving talking to land owners about selling their land or even thinking about selling their land.  

I agree with @Abel Curiel, in fact I used this tactic with my first purchase.

Ive tried the 'driving for dollars' tactic, however to be truthful, in my area there are just not many vacant homes and a lot of the homes in my area that SEEM vacant are actually just being renovated. 

They may have been skipping giving us a written up document to change it and doing it that day as a sneak tactic then just say it was already there.

Generally you want higher income two years before you apply for financing, so you could change your tax strategies depending on which years you need a loan.The most interesting real estate tax tactics to me are the 1031 and cost-segregation depreciation.Also, as a retail business owner, you can qualify for some SBA financing that will allow you to owner-operate commercial real estate to where you could run your store in a building while renting out some of it at the same time to generate that income.And for commercial you can use the income from the target property to help your income.

Wasn't sure what the tactic there was.

In FL, when you're buying someone's Homesteaded Property, this tactic can stop everything dead in it's tracks!

We have done analysis on at least 60 houses and have made about thirty offers on properties where the numbers worked.We are open to criticism, thoughts, and most especially - help.The following is our tactical business plan (high level).

They sent us an offer with a 7 day expiration on it, which I know is a tactic to try to get a quick deal. 

According to this story from KXAN, "The resolution will provide resources for homeowners, many elderly and low-income families, who the city says investors prey upon to sell their homes, "through high pressure, deceptive, and/or exploitative tactics."