#1
when i play the natural harmonic on the 7th fret on the lowest string the sounds vibrates, like an out of string does when you tune with harmonix, this is quite worrying,
i play very low i tune to drop b and a flat regularly and i play with thin strings, what is wrong with my guitar? whenever i play chords etc it sounds a little off, and no mater how hard i try to tune the vibration out, it still remains

im quite concerned

your input would be greatly appreciated
#2
dont use thin strings with such a low tuning look into .11 or .12 gauge, if useing thicker strings doesnt get ride of the vibration it might be your action
#4
highly unlikely to be warped, proably just really slack strings though without seeing your guitar i cant say for sure, look down he neck and if its not twisted your alrite