I own a cort curbow 5. I dropped it so i got a slight lift on the fingerboard till the 2nd fret. The problems is i get extreme buzzing at the 2nd fret. My action from the saddles is as low as possible giving me the best feel. How do i maintain a low string height as well as adjust the truss rod to remove the fret buzz? And whats the diff betn the adjusting string height and the truss rod?