Do any of you seasoned sellers have some tactics for keeping things fair without losing your bidders and your chance for extra profit?

Ask your attorney about this as a tactic.

Can he withdraw his purchase agreement that he signed within 24 hours if he wants to or is this a pressure tactic?

Make it one of those tactical self defense flashlights.You'll probably carry insect repellent spray in case the house has fleas or other nasties.

They get to stay and you fight for years.IMHO the better scenario is the Pete Fortunato tactic,  get an option to buy that has an forced excersize date post death. 

A common tactic is to put the property in a land trust and name your LLC as beneficiary.You can also transfer the property into an LLC or an LP.

Ok thanks I just know it seems like many people want to learn everything at once and get frustrated when things don't work out I just felt if I stick to direct mail let's say and not worry about bandit signs or anything else and keep working until I master that rather then try to do a bunch of marketing tactics at once.

The business end of a .45 in their face would probably be a better negotiation tactic to ward off an assault or robbery.

Well I've been beat by several in regards to recommending concealed carry for those who's states allow it.In addition to using proper tactics to help keep yourself safe (pre-screen, letting people walk ahead of you, staying in particular neighborhoods, etc.), I would also recommend carrying a weapon of some type with you; large flashlight, mace, knife, something.

Your attorney is the one to set the tactics relating to this issue, it's probably better to go after the attorney first, he may flip on the others, never know what can happen.