The harm that occurs on the property will not bleed out to the members of the LLC.An umbrella policy is good to have but it is not a subsitute for an LLC or any other business entity.

You are guaranteed to get some hostile responses at some point, and possibly put yourself in harms way from angry/desparate people.I would stick with a multi-pronged marketing approach (direct mail/postcards, recurring newspaper/pennysaver ads, signs, networking, etc.), and leave the door-knocking to the vaccuum salesmen.Get creative.

And it has pushed him to the point where tonight he told me if they bother him again he will psychically harm them.Can you offer advice to what my course of action should be?

If no one is complaining, then until you have some reason to stop him, I guess there's no harm in letting it go.

I'm confident that the net benefit is greater than the net harm.

Without knowing what amount of time you have available as well as more personal information about your circumstance, no one can give you a definitive answer but I will give you a general answer that will hopefully help but with the understanding that you could have circumstances that make the following useless or harmful to you.In general, low interest rate debt should not be paid off if doing so uses funds that can be used to create/generate income and/or equity that exceeds the funds being used to pay down the mortgage. 

I'm still fresh and definitely want to avoid making mistakes that harm my reputation before I grow my legs.

What harm could come of that?

Just to note, there is no harm in keeping it under your personal name until you grow.

Might be forcing a square peg in a round hole, but no harm in finding the right number and trying!