I have a new JTV-89F and I think the string height is a bit high. I used a straight edge and feeler gage on the seventh fret and it was .024". I saw a video about adjusting the truss rod and this measure was .008" on a different solid body guitar. That is a huge difference. I searched the Line 6 knowledge base and this forum but found nothing. Does anyone know what the spec is? The company I bought this from supposedly did a check on all the settings, which seems in some doubt to me.