I hope i interpret your question correctly....to my understanding it should be on the 6th not the 5th....if you're following a tab then follow what it denotes unless otherwise.
Its the one where you strike the fretted note with your pick and a slight touch/pinch from the side of your thumb which holds the pick...hope i dont confuse you lah bro...the latter one as describe by you
i think artifical harmonics has a faint sound.well im not too sure cause harmonics are harmonics to me.i know how to execute every harmonic so i didnt take note about the name.