might have missed me posting this:
A guide clarified for me what was griefing: about 20 kills in about an hour....you could do everything the OP listed and be done in 5 kills, well under griefer territory...and even then they said you get a warning about it first. Ive come close in game, and i know ive been reported for griefing, never a peep back or a warning or a "your getting close to a warning buddy"
Its going to be difficult to grief, and it reall is going to take effort and actually harass them i think.